{"id":16543,"date":"2026-09-13T21:52:28","date_gmt":"2026-09-13T18:52:28","guid":{"rendered":"https:\/\/www.ihs.com.tr\/blog\/?p=16543"},"modified":"2026-09-13T21:52:28","modified_gmt":"2026-09-13T18:52:28","slug":"vps-guvenlik-duvari-firewall-nedir","status":"publish","type":"post","link":"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/","title":{"rendered":"VPS G\u00fcvenlik Duvar\u0131 (Firewall) Nedir? Sunucu Port Korumas\u0131 Nas\u0131l Sa\u011flan\u0131r?"},"content":{"rendered":"<p>Dijital d\u00fcnyada varl\u0131k g\u00f6steren her projenin ve i\u015fletmenin temelini olu\u015fturan sunucular, ayn\u0131 zamanda siber sald\u0131r\u0131lar\u0131n da birincil hedefidir. \u00d6zellikle esneklik ve performans arayan kullan\u0131c\u0131lar\u0131n tercihi olan Sanal \u00d6zel Sunucular (VPS), internete do\u011frudan ba\u011fl\u0131 olmalar\u0131 nedeniyle s\u00fcrekli bir tehdit alt\u0131ndad\u0131r. Sunucunuzun g\u00fcvenli\u011fini sa\u011flaman\u0131n en temel ve etkili yolu ise gelen ve giden a\u011f trafi\u011fini kontrol eden bir g\u00fcvenlik duvar\u0131 (firewall) yap\u0131land\u0131rmas\u0131d\u0131r. Bu makalede, VPS g\u00fcvenlik duvar\u0131n\u0131n ne oldu\u011funu, sunucu portlar\u0131n\u0131n g\u00fcvenli\u011finiz i\u00e7in neden kritik \u00f6nem ta\u015f\u0131d\u0131\u011f\u0131n\u0131 ve bu dijital kap\u0131lar\u0131 siber tehditlere kar\u015f\u0131 nas\u0131l koruyabilece\u011finizi ad\u0131m ad\u0131m ele alaca\u011f\u0131z.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_77 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0130\u00e7erik Tablosu<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6aa71ac32cd67\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\" id=\"ez-toc-cssicon-toggle-item-6aa71ac32cd67\" aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#VPS-ve-Guvenlik-Duvari-Temel-Kavramlari\" >VPS ve G\u00fcvenlik Duvar\u0131 Temel Kavramlar\u0131<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Sanal-Ozel-Sunucu-VPS-Nedir-ve-Neden-Guvenlige-Ihtiyac-Duyar\" >Sanal \u00d6zel Sunucu (VPS) Nedir ve Neden G\u00fcvenli\u011fe \u0130htiya\u00e7 Duyar?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Guvenlik-Duvari-Firewall-Nedir\" >G\u00fcvenlik Duvar\u0131 (Firewall) Nedir?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#VPS-Guvenlik-Duvarinin-Calisma-Prensibi-ve-Onemi\" >VPS G\u00fcvenlik Duvar\u0131n\u0131n \u00c7al\u0131\u015fma Prensibi ve \u00d6nemi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Donanim-ve-Yazilim-Tabanli-Guvenlik-Duvarlari-Arasindaki-Farklar\" >Donan\u0131m ve Yaz\u0131l\u0131m Tabanl\u0131 G\u00fcvenlik Duvarlar\u0131 Aras\u0131ndaki Farklar<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Sunucu-Portlari-Sunucunuzun-Dijital-Kapilari\" >Sunucu Portlar\u0131: Sunucunuzun Dijital Kap\u0131lar\u0131<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Sunucu-Portu-Nedir-ve-Ne-Ise-Yarar\" >Sunucu Portu Nedir ve Ne \u0130\u015fe Yarar?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Yaygin-Olarak-Kullanilan-Portlar-ve-Iliskili-Servisler-SSH-HTTP-HTTPS-FTP-SMTP-DNS\" >Yayg\u0131n Olarak Kullan\u0131lan Portlar ve \u0130li\u015fkili Servisler (SSH, HTTP, HTTPS, FTP, SMTP, DNS)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Acik-Portlarin-Olusturdugu-Guvenlik-Riskleri-ve-Zafiyetler\" >A\u00e7\u0131k Portlar\u0131n Olu\u015fturdu\u011fu G\u00fcvenlik Riskleri ve Zafiyetler<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Port-Tarama-Port-Scanning-Saldirilari-ve-Amaclari\" >Port Tarama (Port Scanning) Sald\u0131r\u0131lar\u0131 ve Ama\u00e7lar\u0131<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#VPS-Guvenlik-Duvari-Yapilandirmasi-Adim-Adim-Port-Korumasi\" >VPS G\u00fcvenlik Duvar\u0131 Yap\u0131land\u0131rmas\u0131: Ad\u0131m Ad\u0131m Port Korumas\u0131<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Guvenlik-Duvari-Stratejisi-%E2%80%9CVarsayilan-Olarak-Reddet%E2%80%9D-Default-Deny-Politikasi\" >G\u00fcvenlik Duvar\u0131 Stratejisi: &#8220;Varsay\u0131lan Olarak Reddet&#8221; (Default Deny) Politikas\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Linux-Sunucular-icin-Populer-Guvenlik-Duvari-Yazilimlari\" >Linux Sunucular i\u00e7in Pop\u00fcler G\u00fcvenlik Duvar\u0131 Yaz\u0131l\u0131mlar\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Temel-Guvenlik-Duvari-Kurallarinin-Olusturulmasi\" >Temel G\u00fcvenlik Duvar\u0131 Kurallar\u0131n\u0131n Olu\u015fturulmas\u0131<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Ileri-Duzey-Port-Koruma-Teknikleri-ve-En-Iyi-Uygulamalar\" >\u0130leri D\u00fczey Port Koruma Teknikleri ve En \u0130yi Uygulamalar<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#SSH-Port-Guvenligini-Saglama\" >SSH Port G\u00fcvenli\u011fini Sa\u011flama<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Brute-Force-Saldirilarina-Karsi-Korunma-Fail2Ban-Kurulumu-ve-Yapilandirmasi\" >Brute-Force Sald\u0131r\u0131lar\u0131na Kar\u015f\u0131 Korunma: Fail2Ban Kurulumu ve Yap\u0131land\u0131rmas\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Saldiri-Tespit-ve-Onleme-Sistemleri-IDSIPS-ile-Entegrasyon\" >Sald\u0131r\u0131 Tespit ve \u00d6nleme Sistemleri (IDS\/IPS) ile Entegrasyon<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Guvenlik-Duvari-Gunluklerinin-Log-Izlenmesi-ve-Analizinin-Onemi\" >G\u00fcvenlik Duvar\u0131 G\u00fcnl\u00fcklerinin (Log) \u0130zlenmesi ve Analizinin \u00d6nemi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Kullanilmayan-Portlarin-ve-Servislerin-Kapatilmasi\" >Kullan\u0131lmayan Portlar\u0131n ve Servislerin Kapat\u0131lmas\u0131<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Windows-VPS-icin-Guvenlik-Duvari-ve-Port-Yonetimi\" >Windows VPS i\u00e7in G\u00fcvenlik Duvar\u0131 ve Port Y\u00f6netimi<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Windows-Defender-Gelismis-Guvenlik-Duvarina-Giris\" >Windows Defender Geli\u015fmi\u015f G\u00fcvenlik Duvar\u0131&#8217;na Giri\u015f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Gelen-Inbound-ve-Giden-Outbound-Kurallari-Olusturma\" >Gelen (Inbound) ve Giden (Outbound) Kurallar\u0131 Olu\u015fturma<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Belirli-Portlari-Programlari-ve-Servisleri-Yonetme\" >Belirli Portlar\u0131, Programlar\u0131 ve Servisleri Y\u00f6netme<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Windows-Sunucularda-Port-Guvenligi-icin-Pratik-Ipuclari\" >Windows Sunucularda Port G\u00fcvenli\u011fi i\u00e7in Pratik \u0130pu\u00e7lar\u0131<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#VPS-Guvenlik-Duvari-ve-Port-Korumasi-Icin-Neden-IHS-Telekomu-Tercih-Etmelisiniz\" >VPS G\u00fcvenlik Duvar\u0131 ve Port Korumas\u0131 \u0130\u00e7in Neden \u0130HS Telekom&#8217;u Tercih Etmelisiniz?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Gelismis-Ag-Guvenligi-Altyapisi-ve-Standart-DDoS-Korumasi\" >Geli\u015fmi\u015f A\u011f G\u00fcvenli\u011fi Altyap\u0131s\u0131 ve Standart DDoS Korumas\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Kolay-Yonetim-Panelleri-Uzerinden-Guvenlik-Duvari-Kontrolu\" >Kolay Y\u00f6netim Panelleri \u00dczerinden G\u00fcvenlik Duvar\u0131 Kontrol\u00fc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#724-Uzman-Teknik-Destek-ile-Guvenlik-Sorunlarina-Hizli-Cozumler\" >7\/24 Uzman Teknik Destek ile G\u00fcvenlik Sorunlar\u0131na H\u0131zl\u0131 \u00c7\u00f6z\u00fcmler<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.ihs.com.tr\/blog\/vps-guvenlik-duvari-firewall-nedir\/#Yuksek-Performansli-ve-Guvenilir-Sunucu-Altyapisi\" >Y\u00fcksek Performansl\u0131 ve G\u00fcvenilir Sunucu Altyap\u0131s\u0131<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"VPS-ve-Guvenlik-Duvari-Temel-Kavramlari\"><\/span>VPS ve G\u00fcvenlik Duvar\u0131 Temel Kavramlar\u0131<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Sunucu g\u00fcvenli\u011finin ilk katman\u0131n\u0131 olu\u015fturan VPS ve g\u00fcvenlik duvar\u0131, dijital varl\u0131klar\u0131n\u0131z\u0131 korumak i\u00e7in birlikte \u00e7al\u0131\u015fmas\u0131 gereken iki temel bile\u015fendir. Bu b\u00f6l\u00fcmde, bu teknolojilerin ne anlama geldi\u011fini, neden birbirlerine ihtiya\u00e7 duyduklar\u0131n\u0131 ve nas\u0131l \u00e7al\u0131\u015ft\u0131klar\u0131n\u0131 inceleyerek sa\u011flam bir temel olu\u015fturaca\u011f\u0131z.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Sanal-Ozel-Sunucu-VPS-Nedir-ve-Neden-Guvenlige-Ihtiyac-Duyar\"><\/span>Sanal \u00d6zel Sunucu (VPS) Nedir ve Neden G\u00fcvenli\u011fe \u0130htiya\u00e7 Duyar?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Sanal \u00d6zel Sunucu (Virtual Private Server), fiziksel bir sunucunun sanalla\u015ft\u0131rma teknolojisi ile birden \u00e7ok ba\u011f\u0131ms\u0131z sanal <a href=\"https:\/\/www.ihs.com.tr\/sunucu-kiralama\/\" target=\"_blank\">sunucu<\/a> b\u00f6l\u00fcm\u00fcne ayr\u0131lmas\u0131yla olu\u015fturulan bir hosting \u00e7\u00f6z\u00fcm\u00fcd\u00fcr. Her <a href=\"https:\/\/www.ihs.com.tr\/sunucu-kiralama\/vps-server.html\" target=\"_blank\">VPS<\/a>, kendine ait i\u015fletim sistemine, i\u015flemci g\u00fcc\u00fcne, RAM&#8217;e ve disk alan\u0131na sahiptir ve kullan\u0131c\u0131ya tam k\u00f6k (root) eri\u015fimi sunar. Bu izolasyon ve kontrol seviyesi, payla\u015f\u0131ml\u0131 hostinge g\u00f6re daha y\u00fcksek performans ve esneklik sa\u011flar. Ancak bu \u00f6zerklik, ayn\u0131 zamanda b\u00fcy\u00fck bir sorumlulu\u011fu da beraberinde getirir: g\u00fcvenlik. \u0130nternete do\u011frudan a\u00e7\u0131k olan bir VPS, k\u00f6t\u00fc niyetli yaz\u0131l\u0131mlar, yetkisiz eri\u015fim denemeleri ve DDoS sald\u0131r\u0131lar\u0131 gibi say\u0131s\u0131z tehdide maruz kal\u0131r. Bu nedenle, sunucuyu ve bar\u0131nd\u0131rd\u0131\u011f\u0131 verileri korumak i\u00e7in proaktif g\u00fcvenlik \u00f6nlemleri almak zorunludur.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Guvenlik-Duvari-Firewall-Nedir\"><\/span>G\u00fcvenlik Duvar\u0131 (Firewall) Nedir?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>G\u00fcvenlik duvar\u0131 (Firewall), en basit tan\u0131m\u0131yla, bir a\u011f veya sunucu ile d\u0131\u015f d\u00fcnya (genellikle internet) aras\u0131na yerle\u015ftirilen bir g\u00fcvenlik sistemidir. Temel g\u00f6revi, \u00f6nceden tan\u0131mlanm\u0131\u015f kurallar setine g\u00f6re a\u011f trafi\u011fini analiz ederek hangi veri paketlerinin ge\u00e7ece\u011fine, hangilerinin engellenece\u011fine karar vermektir. G\u00fcvenlik duvar\u0131, sunucunuza gelen ve sunucunuzdan giden t\u00fcm veri trafi\u011fi i\u00e7in bir kontrol noktas\u0131 i\u015flevi g\u00f6rerek, yetkisiz eri\u015fim giri\u015fimlerini ve potansiyel olarak zararl\u0131 veri paketlerini filtreler. Bu sayede, sunucunuzun yaln\u0131zca me\u015fru ve beklenen trafikle ileti\u015fim kurmas\u0131n\u0131 sa\u011flar.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"VPS-Guvenlik-Duvarinin-Calisma-Prensibi-ve-Onemi\"><\/span>VPS G\u00fcvenlik Duvar\u0131n\u0131n \u00c7al\u0131\u015fma Prensibi ve \u00d6nemi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Bir VPS g\u00fcvenlik duvar\u0131, sunucunun dijital s\u0131n\u0131rlar\u0131n\u0131 koruyan bir bek\u00e7i gibidir. Gelen (inbound) ve giden (outbound) t\u00fcm a\u011f ba\u011flant\u0131lar\u0131n\u0131 denetler. \u00c7al\u0131\u015fma prensibi, genellikle &#8220;paket filtreleme&#8221; tekni\u011fine dayan\u0131r. Her veri paketi, kaynak IP adresi, hedef IP adresi, kaynak portu, hedef portu ve kullan\u0131lan protokol (TCP, UDP, ICMP vb.) gibi bilgileri i\u00e7erir. G\u00fcvenlik duvar\u0131, bu bilgileri kendi kural tablosuyla kar\u015f\u0131la\u015ft\u0131r\u0131r. E\u011fer gelen bir paket, izin verilen bir kurala (\u00f6rne\u011fin, &#8220;80 numaral\u0131 porta gelen web trafi\u011fine izin ver&#8221;) uyuyorsa ge\u00e7i\u015fine izin verilir. E\u011fer hi\u00e7bir kurala uymuyorsa, varsay\u0131lan politika (genellikle &#8220;her \u015feyi engelle&#8221;) devreye girer ve paket d\u00fc\u015f\u00fcr\u00fcl\u00fcr. Bu mekanizma, sunucunuzu port taramalar\u0131, brute-force sald\u0131r\u0131lar\u0131 ve bilinen zafiyetleri s\u00f6m\u00fcrmeye \u00e7al\u0131\u015fan k\u00f6t\u00fc ama\u00e7l\u0131 trafikten koruman\u0131n en etkili yoludur.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Donanim-ve-Yazilim-Tabanli-Guvenlik-Duvarlari-Arasindaki-Farklar\"><\/span>Donan\u0131m ve Yaz\u0131l\u0131m Tabanl\u0131 G\u00fcvenlik Duvarlar\u0131 Aras\u0131ndaki Farklar<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>G\u00fcvenlik duvarlar\u0131 temel olarak donan\u0131m ve yaz\u0131l\u0131m tabanl\u0131 olmak \u00fczere ikiye ayr\u0131l\u0131r. Her ikisinin de kendine \u00f6zg\u00fc avantajlar\u0131 ve kullan\u0131m senaryolar\u0131 vard\u0131r. VPS kullan\u0131c\u0131lar\u0131 i\u00e7in bu fark\u0131 anlamak, do\u011fru g\u00fcvenlik stratejisini belirlemede \u00f6nemlidir.<\/p>\n<div class=\"karsilastirma\">\n<table>\n<thead>\n<tr>\n<th>\u00d6zellik<\/th>\n<th>Donan\u0131m Tabanl\u0131 G\u00fcvenlik Duvar\u0131<\/th>\n<th>Yaz\u0131l\u0131m Tabanl\u0131 G\u00fcvenlik Duvar\u0131<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Konum<\/strong><\/td>\n<td>A\u011f ve sunucu aras\u0131na yerle\u015ftirilen fiziksel bir cihazd\u0131r.<\/td>\n<td>Do\u011frudan sunucunun i\u015fletim sistemi \u00fczerine kurulan bir programd\u0131r.<\/td>\n<\/tr>\n<tr>\n<td><strong>Kapsam<\/strong><\/td>\n<td>Genellikle t\u00fcm bir a\u011f\u0131 (birden fazla sunucuyu) korur.<\/td>\n<td>Yaln\u0131zca kurulu oldu\u011fu tek bir sunucuyu korur.<\/td>\n<\/tr>\n<tr>\n<td><strong>Performans<\/strong><\/td>\n<td>Kendi i\u015flemcisi ve belle\u011fi oldu\u011fu i\u00e7in sunucu kaynaklar\u0131n\u0131 t\u00fcketmez, y\u00fcksek performansl\u0131d\u0131r.<\/td>\n<td>Sunucunun CPU ve RAM kaynaklar\u0131n\u0131 kullan\u0131r, yo\u011fun trafikte performans\u0131 etkileyebilir.<\/td>\n<\/tr>\n<tr>\n<td><strong>Maliyet<\/strong><\/td>\n<td>Genellikle daha y\u00fcksek ba\u015flang\u0131\u00e7 maliyetine sahiptir.<\/td>\n<td>\u00c7o\u011fu zaman \u00fccretsizdir (\u00f6rn: UFW, iptables) veya daha d\u00fc\u015f\u00fck maliyetlidir.<\/td>\n<\/tr>\n<tr>\n<td><strong>Y\u00f6netim<\/strong><\/td>\n<td>Ayr\u0131 bir aray\u00fcz \u00fczerinden y\u00f6netilir.<\/td>\n<td>Sunucuya ba\u011flan\u0131larak komut sat\u0131r\u0131 veya grafik aray\u00fcz ile y\u00f6netilir.<\/td>\n<\/tr>\n<tr>\n<td><strong>VPS \u0130\u00e7in Uygunluk<\/strong><\/td>\n<td>Genellikle veri merkezi veya hosting sa\u011flay\u0131c\u0131 taraf\u0131ndan sunulur.<\/td>\n<td>VPS kullan\u0131c\u0131lar\u0131 i\u00e7in standart ve en yayg\u0131n \u00e7\u00f6z\u00fcmd\u00fcr.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"Sunucu-Portlari-Sunucunuzun-Dijital-Kapilari\"><\/span>Sunucu Portlar\u0131: Sunucunuzun Dijital Kap\u0131lar\u0131<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Sunucunuzun d\u0131\u015f d\u00fcnya ile ileti\u015fim kurmas\u0131n\u0131 sa\u011flayan portlar, ayn\u0131 zamanda en zay\u0131f halkalar\u0131ndan biri olabilir. Bu dijital kap\u0131lar\u0131n ne oldu\u011funu, nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 ve potansiyel risklerini anlamak, etkili bir g\u00fcvenlik duvar\u0131 yap\u0131land\u0131rmas\u0131n\u0131n temelini olu\u015fturur.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Sunucu-Portu-Nedir-ve-Ne-Ise-Yarar\"><\/span>Sunucu Portu Nedir ve Ne \u0130\u015fe Yarar?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Bir sunucu portu, sunucu \u00fczerindeki belirli bir hizmet veya uygulama i\u00e7in ayr\u0131lm\u0131\u015f sanal bir ileti\u015fim biti\u015f noktas\u0131d\u0131r. IP adresi sunucunun kendisini adreslerken, port numaras\u0131 o sunucu \u00fczerindeki hangi servisin (web sunucusu, e-posta sunucusu, veritaban\u0131 vb.) hedeflendi\u011fini belirtir. \u00d6rne\u011fin, bir kullan\u0131c\u0131 web sitenize eri\u015fmek istedi\u011finde, taray\u0131c\u0131s\u0131 sunucunuzun IP adresine ve genellikle web trafi\u011fi i\u00e7in standart olan 80 (HTTP) veya 443 (HTTPS) numaral\u0131 porta bir istek g\u00f6nderir. Portlar olmadan, sunucu gelen iste\u011fin hangi uygulamaya y\u00f6nelik oldu\u011funu bilemezdi. Toplamda 65,535 adet port bulunur ve bunlar \u00fc\u00e7 ana kategoriye ayr\u0131l\u0131r: \u0130yi Bilinen Portlar (0-1023), Kay\u0131tl\u0131 Portlar (1024-49151) ve Dinamik\/\u00d6zel Portlar (49152-65535).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Yaygin-Olarak-Kullanilan-Portlar-ve-Iliskili-Servisler-SSH-HTTP-HTTPS-FTP-SMTP-DNS\"><\/span>Yayg\u0131n Olarak Kullan\u0131lan Portlar ve \u0130li\u015fkili Servisler (SSH, HTTP, HTTPS, FTP, SMTP, DNS)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Sunucu y\u00f6netiminde ve internetin i\u015fleyi\u015finde baz\u0131 portlar standartla\u015fm\u0131\u015ft\u0131r. Bu portlar\u0131 bilmek, hangi servislere izin vermeniz veya hangilerini k\u0131s\u0131tlaman\u0131z gerekti\u011fini anlaman\u0131za yard\u0131mc\u0131 olur.<\/p>\n<div class=\"karsilastirma\">\n<table>\n<thead>\n<tr>\n<th>Port Numaras\u0131<\/th>\n<th>Protokol<\/th>\n<th>Servis Ad\u0131<\/th>\n<th>A\u00e7\u0131klama<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>21<\/td>\n<td>TCP<\/td>\n<td>FTP (File Transfer Protocol)<\/td>\n<td>Sunucuya dosya y\u00fcklemek veya sunucudan dosya indirmek i\u00e7in kullan\u0131l\u0131r.<\/td>\n<\/tr>\n<tr>\n<td>22<\/td>\n<td>TCP<\/td>\n<td>SSH (Secure Shell)<\/td>\n<td>Sunucuya g\u00fcvenli bir \u015fekilde uzaktan komut sat\u0131r\u0131 eri\u015fimi sa\u011flar.<\/td>\n<\/tr>\n<tr>\n<td>25<\/td>\n<td>TCP<\/td>\n<td>SMTP (Simple Mail Transfer Protocol)<\/td>\n<td>E-posta g\u00f6ndermek i\u00e7in kullan\u0131l\u0131r.<\/td>\n<\/tr>\n<tr>\n<td>53<\/td>\n<td>TCP\/UDP<\/td>\n<td>DNS (Domain Name System)<\/td>\n<td>Alan adlar\u0131n\u0131 IP adreslerine \u00e7evirir.<\/td>\n<\/tr>\n<tr>\n<td>80<\/td>\n<td>TCP<\/td>\n<td>HTTP (HyperText Transfer Protocol)<\/td>\n<td>\u015eifrelenmemi\u015f web trafi\u011fi i\u00e7in standart porttur.<\/td>\n<\/tr>\n<tr>\n<td>443<\/td>\n<td>TCP<\/td>\n<td>HTTPS (HTTP Secure)<\/td>\n<td>SSL\/TLS ile \u015fifrelenmi\u015f, g\u00fcvenli web trafi\u011fi i\u00e7in kullan\u0131l\u0131r.<\/td>\n<\/tr>\n<tr>\n<td>3306<\/td>\n<td>TCP<\/td>\n<td>MySQL<\/td>\n<td>Pop\u00fcler bir veritaban\u0131 y\u00f6netim sistemi olan MySQL i\u00e7in varsay\u0131lan porttur.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Acik-Portlarin-Olusturdugu-Guvenlik-Riskleri-ve-Zafiyetler\"><\/span>A\u00e7\u0131k Portlar\u0131n Olu\u015fturdu\u011fu G\u00fcvenlik Riskleri ve Zafiyetler<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Sunucunuzda a\u00e7\u0131k olan her port, potansiyel bir giri\u015f kap\u0131s\u0131d\u0131r. Bir portun &#8220;a\u00e7\u0131k&#8221; olmas\u0131, o portu dinleyen bir servis veya uygulaman\u0131n \u00e7al\u0131\u015ft\u0131\u011f\u0131 ve d\u0131\u015far\u0131dan gelen ba\u011flant\u0131lar\u0131 kabul etmeye haz\u0131r oldu\u011fu anlam\u0131na gelir. E\u011fer bu serviste bilinen bir g\u00fcvenlik zafiyeti varsa (\u00f6rne\u011fin, g\u00fcncel olmayan bir yaz\u0131l\u0131m), sald\u0131rganlar bu zafiyeti s\u00f6m\u00fcrerek sunucunuza yetkisiz eri\u015fim sa\u011flayabilirler. \u0130htiya\u00e7 duyulmayan servislerin \u00e7al\u0131\u015f\u0131r durumda b\u0131rak\u0131lmas\u0131 ve dolay\u0131s\u0131yla ilgili portlar\u0131n a\u00e7\u0131k olmas\u0131, sald\u0131r\u0131 y\u00fczeyini gereksiz yere geni\u015fletir. \u00d6rne\u011fin, kullanmad\u0131\u011f\u0131n\u0131z bir FTP sunucusunun 21 numaral\u0131 portu a\u00e7\u0131ksa, bu port \u00fczerinden ger\u00e7ekle\u015ftirilebilecek brute-force (kaba kuvvet) sald\u0131r\u0131lar\u0131na veya bilinen FTP yaz\u0131l\u0131m\u0131 a\u00e7\u0131klar\u0131na kar\u015f\u0131 savunmas\u0131z kal\u0131rs\u0131n\u0131z.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Port-Tarama-Port-Scanning-Saldirilari-ve-Amaclari\"><\/span>Port Tarama (Port Scanning) Sald\u0131r\u0131lar\u0131 ve Ama\u00e7lar\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Port taramas\u0131, siber sald\u0131rganlar\u0131n bir sald\u0131r\u0131 \u00f6ncesinde ger\u00e7ekle\u015ftirdi\u011fi en yayg\u0131n ke\u015fif eylemlerinden biridir. Sald\u0131rgan, \u00f6zel yaz\u0131l\u0131mlar kullanarak hedef sunucunun IP adresindeki binlerce portu s\u0131rayla kontrol eder ve hangilerinin a\u00e7\u0131k, kapal\u0131 veya filtrelenmi\u015f oldu\u011funu tespit etmeye \u00e7al\u0131\u015f\u0131r. Port taramas\u0131n\u0131n temel ama\u00e7lar\u0131 \u015funlard\u0131r:<\/p>\n<ul>\n<li><b>A\u00e7\u0131k Portlar\u0131 Belirleme:<\/b> Sunucuda hangi servislerin \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 ve hangi kap\u0131lar\u0131n d\u0131\u015f d\u00fcnyaya a\u00e7\u0131k oldu\u011funu anlamak.<\/li>\n<li><b>Servis ve Versiyon Tespiti:<\/b> A\u00e7\u0131k portlarda \u00e7al\u0131\u015fan servislerin (\u00f6rn: Apache 2.4.5, OpenSSH 8.1) t\u00fcr\u00fcn\u00fc ve s\u00fcr\u00fcm numaras\u0131n\u0131 \u00f6\u011frenmek.<\/li>\n<li><b>Zafiyet Arama:<\/b> Tespit edilen servis ve s\u00fcr\u00fcm bilgilerini kullanarak, bu yaz\u0131l\u0131mlara ait bilinen g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 (exploit) aramak ve sald\u0131r\u0131 plan\u0131 olu\u015fturmak.<\/li>\n<\/ul>\n<p>G\u00fcvenlik duvar\u0131n\u0131z, bu t\u00fcr tarama giri\u015fimlerini tespit edip engelleyerek sald\u0131rganlar\u0131n sunucunuz hakk\u0131nda bilgi toplamas\u0131n\u0131 zorla\u015ft\u0131rabilir.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"VPS-Guvenlik-Duvari-Yapilandirmasi-Adim-Adim-Port-Korumasi\"><\/span>VPS G\u00fcvenlik Duvar\u0131 Yap\u0131land\u0131rmas\u0131: Ad\u0131m Ad\u0131m Port Korumas\u0131<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Teorik bilgileri \u00f6\u011frendikten sonra s\u0131ra, sunucumuzu pratik ad\u0131mlarla nas\u0131l koruyaca\u011f\u0131m\u0131z\u0131 \u00f6\u011frenmeye geldi. Etkili bir g\u00fcvenlik duvar\u0131 yap\u0131land\u0131rmas\u0131, do\u011fru stratejiyi belirlemek, uygun arac\u0131 se\u00e7mek ve temel kurallar\u0131 do\u011fru bir \u015fekilde olu\u015fturmaktan ge\u00e7er. Bu b\u00f6l\u00fcmde, \u00f6zellikle Linux tabanl\u0131 VPS&#8217;ler i\u00e7in bu ad\u0131mlar\u0131 detayland\u0131raca\u011f\u0131z.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Guvenlik-Duvari-Stratejisi-%E2%80%9CVarsayilan-Olarak-Reddet%E2%80%9D-Default-Deny-Politikasi\"><\/span>G\u00fcvenlik Duvar\u0131 Stratejisi: &#8220;Varsay\u0131lan Olarak Reddet&#8221; (Default Deny) Politikas\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>En g\u00fcvenli ve end\u00fcstri standard\u0131 olarak kabul edilen g\u00fcvenlik duvar\u0131 stratejisi &#8220;Varsay\u0131lan Olarak Reddet&#8221; (Default Deny) politikas\u0131d\u0131r. Bu yakla\u015f\u0131m\u0131n mant\u0131\u011f\u0131 basittir: \u0130zin verilmeyen her \u015fey yasakt\u0131r. Yani, g\u00fcvenlik duvar\u0131 varsay\u0131lan olarak t\u00fcm gelen (ve bazen giden) trafi\u011fi engeller. Daha sonra, sadece sunucunun \u00e7al\u0131\u015fmas\u0131 i\u00e7in kesinlikle gerekli olan belirli portlara ve servislere (\u00f6rne\u011fin, web trafi\u011fi i\u00e7in 80 ve 443, y\u00f6netim i\u00e7in SSH portu) \u00f6zel kurallarla izin verilir. Bu strateji, bilmedi\u011finiz veya unuttu\u011funuz bir servisin istemeden d\u0131\u015f d\u00fcnyaya a\u00e7\u0131lmas\u0131n\u0131 engelleyerek sald\u0131r\u0131 y\u00fczeyini minimumda tutar. &#8220;Varsay\u0131lan Olarak \u0130zin Ver&#8221; (Default Allow) politikas\u0131n\u0131n aksine, bu y\u00f6ntem \u00e7ok daha proaktif ve g\u00fcvenlidir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Linux-Sunucular-icin-Populer-Guvenlik-Duvari-Yazilimlari\"><\/span>Linux Sunucular i\u00e7in Pop\u00fcler G\u00fcvenlik Duvar\u0131 Yaz\u0131l\u0131mlar\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Linux ekosistemi, g\u00fcvenlik duvar\u0131 y\u00f6netimi i\u00e7in \u00e7e\u015fitli g\u00fc\u00e7l\u00fc ara\u00e7lar sunar. Her birinin kendine \u00f6zg\u00fc kullan\u0131m kolayl\u0131\u011f\u0131 ve esneklik seviyesi vard\u0131r. Bir <a href=\"https:\/\/www.ihs.com.tr\/web-hosting\/linux-hosting.html\" target=\"_blank\">Linux Hosting<\/a> kullan\u0131c\u0131s\u0131n\u0131n bu ara\u00e7lar\u0131 bilmesi \u00f6nemlidir.<\/p>\n<h4>UFW (Uncomplicated Firewall): Kolay Kurulum ve Y\u00f6netim<\/h4>\n<p>UFW, ad\u0131ndan da anla\u015f\u0131laca\u011f\u0131 gibi, karma\u015f\u0131k `iptables` komutlar\u0131 i\u00e7in kullan\u0131c\u0131 dostu bir aray\u00fcz sa\u011flar. \u00d6zellikle yeni ba\u015flayanlar i\u00e7in idealdir. Ubuntu da\u011f\u0131t\u0131mlar\u0131nda varsay\u0131lan olarak gelir ve basit komutlarla temel kurallar\u0131 h\u0131zla olu\u015fturman\u0131za olanak tan\u0131r. \u00d6rne\u011fin, `ufw allow ssh` veya `ufw allow 443\/tcp` gibi komutlarla kolayca portlara izin verebilirsiniz.<\/p>\n<h4>iptables: Geli\u015fmi\u015f ve Esnek Kural Tan\u0131mlama<\/h4>\n<p>iptables, Linux \u00e7ekirde\u011finin Netfilter mod\u00fcl\u00fcn\u00fc y\u00f6netmek i\u00e7in kullan\u0131lan standart ve \u00e7ok g\u00fc\u00e7l\u00fc bir komut sat\u0131r\u0131 arac\u0131d\u0131r. Neredeyse t\u00fcm Linux da\u011f\u0131t\u0131mlar\u0131nda bulunur. UFW gibi ara\u00e7lar arka planda asl\u0131nda `iptables` komutlar\u0131n\u0131 kullan\u0131r. `iptables` ile \u00e7ok daha karma\u015f\u0131k ve gran\u00fcler kurallar olu\u015fturabilir, paketlerin durumunu (stateful inspection) takip edebilir ve a\u011f adresi \u00e7evirisi (NAT) gibi ileri d\u00fczey i\u015flemler yapabilirsiniz. Ancak s\u00f6zdizimi daha karma\u015f\u0131k oldu\u011fu i\u00e7in \u00f6\u011frenmesi zaman alabilir.<\/p>\n<h4>firewalld: Dinamik Y\u00f6netim ve B\u00f6lgeler (Zones)<\/h4>\n<p>firewalld, \u00f6zellikle Red Hat tabanl\u0131 da\u011f\u0131t\u0131mlarda (CentOS, Fedora) varsay\u0131lan olarak gelen modern bir g\u00fcvenlik duvar\u0131 \u00e7\u00f6z\u00fcm\u00fcd\u00fcr. En belirgin \u00f6zelli\u011fi, &#8220;b\u00f6lgeler&#8221; (zones) konseptidir. B\u00f6lgeler (public, private, work, home vb.), a\u011f ba\u011flant\u0131lar\u0131n\u0131n g\u00fcven seviyesine g\u00f6re \u00f6nceden tan\u0131mlanm\u0131\u015f kural setleridir. \u00d6rne\u011fin, bir kafedeki halka a\u00e7\u0131k bir a\u011fa ba\u011fland\u0131\u011f\u0131n\u0131zda &#8220;public&#8221; b\u00f6lgesi aktif olur ve daha k\u0131s\u0131tlay\u0131c\u0131 kurallar uygulan\u0131r. `firewalld`, servisleri yeniden ba\u015flatmadan kurallar\u0131 an\u0131nda (dinamik olarak) de\u011fi\u015ftirme yetene\u011fi ile de \u00f6ne \u00e7\u0131kar.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Temel-Guvenlik-Duvari-Kurallarinin-Olusturulmasi\"><\/span>Temel G\u00fcvenlik Duvar\u0131 Kurallar\u0131n\u0131n Olu\u015fturulmas\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Hangi arac\u0131 se\u00e7erseniz se\u00e7in, olu\u015fturman\u0131z gereken temel kurallar benzerdir. \u0130\u015fte en kritik ad\u0131mlar:<\/p>\n<h4>Gelen (INPUT) ve Giden (OUTPUT) Trafi\u011fi Y\u00f6netme<\/h4>\n<p>G\u00fcvenlik duvar\u0131 kurallar\u0131 genellikle \u00fc\u00e7 ana &#8220;zincir&#8221; (chain) \u00fczerine kurulur: INPUT (sunucuya gelen trafik), OUTPUT (sunucudan \u00e7\u0131kan trafik) ve FORWARD (sunucunun bir a\u011f ge\u00e7idi gibi davrand\u0131\u011f\u0131, bir aray\u00fczden gelip di\u011ferine y\u00f6nlendirilen trafik). Bir VPS i\u00e7in en \u00f6nemli zincir INPUT&#8217;tur. &#8220;Default Deny&#8221; politikas\u0131 gere\u011fi, INPUT zincirinin varsay\u0131lan kural\u0131 &#8220;DROP&#8221; (paketi sessizce d\u00fc\u015f\u00fcr) veya &#8220;REJECT&#8221; (paketi hata mesaj\u0131yla reddet) olarak ayarlanmal\u0131d\u0131r. OUTPUT zinciri genellikle daha esnek b\u0131rak\u0131l\u0131r ve varsay\u0131lan olarak &#8220;ACCEPT&#8221; (izin ver) olarak ayarlan\u0131r, ancak daha s\u0131k\u0131 g\u00fcvenlik gerektiren ortamlarda giden trafik de k\u0131s\u0131tlanabilir.<\/p>\n<h4>Belirli Portlara \u0130zin Verme (\u00d6rn: Web Sunucusu i\u00e7in 80 ve 443)<\/h4>\n<p>Varsay\u0131lan politikay\u0131 trafi\u011fi reddetmek olarak ayarlad\u0131ktan sonra, ihtiya\u00e7 duydu\u011funuz servislere tek tek izin vermelisiniz. \u00d6rne\u011fin, bir web sunucusu \u00e7al\u0131\u015ft\u0131r\u0131yorsan\u0131z, HTTP (80\/TCP) ve HTTPS (443\/TCP) portlar\u0131na gelen trafi\u011fe izin vermeniz gerekir. Y\u00f6netim i\u00e7in SSH (22\/TCP) portuna da izin vermelisiniz. Bu izinler, &#8220;ACCEPT&#8221; kurallar\u0131 olarak g\u00fcvenlik duvar\u0131 yap\u0131land\u0131rman\u0131za eklenir.<\/p>\n<h4>Belirli IP Adreslerini veya IP Aral\u0131klar\u0131n\u0131 Engelleme\/\u0130zin Verme<\/h4>\n<p>G\u00fcvenlik duvarlar\u0131, sadece portlara g\u00f6re de\u011fil, ayn\u0131 zamanda kaynak IP adreslerine g\u00f6re de filtreleme yapabilir. \u00d6rne\u011fin, sunucu y\u00f6netimi i\u00e7in kulland\u0131\u011f\u0131n\u0131z SSH portuna sadece ofisinizin veya evinizin statik IP adresinden eri\u015fim izni verebilirsiniz. Bu, d\u00fcnyan\u0131n geri kalan\u0131ndan gelen SSH ba\u011flant\u0131 denemelerini tamamen engelleyerek g\u00fcvenli\u011fi \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r. Benzer \u015fekilde, sunucunuza s\u00fcrekli olarak sald\u0131rd\u0131\u011f\u0131n\u0131 tespit etti\u011finiz k\u00f6t\u00fc niyetli bir IP adresini veya IP blo\u011funu kal\u0131c\u0131 olarak engellemek i\u00e7in de &#8220;DROP&#8221; kurallar\u0131 ekleyebilirsiniz.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ileri-Duzey-Port-Koruma-Teknikleri-ve-En-Iyi-Uygulamalar\"><\/span>\u0130leri D\u00fczey Port Koruma Teknikleri ve En \u0130yi Uygulamalar<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Temel g\u00fcvenlik duvar\u0131 yap\u0131land\u0131rmas\u0131, g\u00fcvenli\u011fin ilk ve en \u00f6nemli ad\u0131m\u0131d\u0131r. Ancak siber tehditler s\u00fcrekli geli\u015fti\u011fi i\u00e7in, koruma seviyesini daha da art\u0131rmak i\u00e7in ileri d\u00fczey teknikler ve en iyi uygulamalardan faydalanmak kritik \u00f6neme sahiptir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"SSH-Port-Guvenligini-Saglama\"><\/span>SSH Port G\u00fcvenli\u011fini Sa\u011flama<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>SSH (Secure Shell), sunucunuza uzaktan y\u00f6netim eri\u015fimi sa\u011flayan en temel servistir. Bu nedenle, sald\u0131rganlar\u0131n en \u00e7ok hedef ald\u0131\u011f\u0131 portlar\u0131n ba\u015f\u0131nda gelir. SSH g\u00fcvenli\u011fini sa\u011flamak, genel sunucu g\u00fcvenli\u011finin temel ta\u015f\u0131d\u0131r.<\/p>\n<h4>Varsay\u0131lan SSH Portunu De\u011fi\u015ftirme<\/h4>\n<p>Sald\u0131rganlar ve otomatik botlar, varsay\u0131lan SSH portu olan 22&#8217;yi s\u00fcrekli olarak tarar. Bu portu, 1024 \u00fczerindeki standart d\u0131\u015f\u0131 bir port numaras\u0131yla (\u00f6rne\u011fin, 2222) de\u011fi\u015ftirmek, bu otomatik taramalar\u0131n b\u00fcy\u00fck \u00e7o\u011funlu\u011fundan an\u0131nda kurtulman\u0131z\u0131 sa\u011flar. Bu basit de\u011fi\u015fiklik, &#8220;security through obscurity&#8221; (gizlilik yoluyla g\u00fcvenlik) prensibine dayan\u0131r ve sald\u0131rganlar\u0131n i\u015fini zorla\u015ft\u0131r\u0131r. Portu de\u011fi\u015ftirdikten sonra, g\u00fcvenlik duvar\u0131n\u0131zda yeni porta izin verip eski 22 numaral\u0131 portu kapatt\u0131\u011f\u0131n\u0131zdan emin olmal\u0131s\u0131n\u0131z.<\/p>\n<h4>\u015eifre ile Giri\u015fi Kapat\u0131p SSH Anahtar\u0131 (Key) Kullan\u0131m\u0131n\u0131 Zorunlu K\u0131lma<\/h4>\n<p>\u015eifreler, kaba kuvvet (brute-force) sald\u0131r\u0131lar\u0131 ile k\u0131r\u0131labilir. \u00c7ok daha g\u00fcvenli bir y\u00f6ntem olan SSH anahtar tabanl\u0131 kimlik do\u011frulama, bir \u00f6zel anahtar (sizin bilgisayar\u0131n\u0131zda saklan\u0131r) ve bir genel anahtar (sunucunuza y\u00fcklenir) \u00e7ifti kullan\u0131r. Bu sistem, \u015fifrelerden \u00e7ok daha karma\u015f\u0131k ve k\u0131r\u0131lmas\u0131 neredeyse imkans\u0131zd\u0131r. Sunucu yap\u0131land\u0131rman\u0131zda \u015fifre ile giri\u015fi tamamen devre d\u0131\u015f\u0131 b\u0131rak\u0131p sadece SSH anahtar\u0131 kullan\u0131m\u0131n\u0131 zorunlu k\u0131larak, brute-force sald\u0131r\u0131 riskini ortadan kald\u0131rabilirsiniz.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Brute-Force-Saldirilarina-Karsi-Korunma-Fail2Ban-Kurulumu-ve-Yapilandirmasi\"><\/span>Brute-Force Sald\u0131r\u0131lar\u0131na Kar\u015f\u0131 Korunma: Fail2Ban Kurulumu ve Yap\u0131land\u0131rmas\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Fail2Ban, sunucu log dosyalar\u0131n\u0131 s\u00fcrekli olarak izleyen ve \u015f\u00fcpheli aktiviteleri (\u00f6rne\u011fin, belirli bir s\u00fcre i\u00e7inde \u00e7ok say\u0131da ba\u015far\u0131s\u0131z giri\u015f denemesi) tespit etti\u011finde, bu aktivitenin geldi\u011fi IP adresini otomatik olarak g\u00fcvenlik duvar\u0131 kurallar\u0131na ekleyerek ge\u00e7ici veya kal\u0131c\u0131 olarak engelleyen bir yaz\u0131l\u0131md\u0131r. SSH, FTP, SMTP gibi servislere y\u00f6nelik kaba kuvvet sald\u0131r\u0131lar\u0131n\u0131 \u00f6nlemede son derece etkilidir. Fail2Ban&#8217;\u0131 kurup yap\u0131land\u0131rarak, sunucunuzun bu t\u00fcr otomatik sald\u0131r\u0131lara kar\u015f\u0131 kendini aktif olarak savunmas\u0131n\u0131 sa\u011flayabilirsiniz.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Saldiri-Tespit-ve-Onleme-Sistemleri-IDSIPS-ile-Entegrasyon\"><\/span>Sald\u0131r\u0131 Tespit ve \u00d6nleme Sistemleri (IDS\/IPS) ile Entegrasyon<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Daha geli\u015fmi\u015f bir g\u00fcvenlik katman\u0131 i\u00e7in Sald\u0131r\u0131 Tespit Sistemleri (IDS) ve Sald\u0131r\u0131 \u00d6nleme Sistemleri (IPS) kullan\u0131labilir. IDS, a\u011f trafi\u011fini ve sistem g\u00fcnl\u00fcklerini analiz ederek bilinen sald\u0131r\u0131 kal\u0131plar\u0131n\u0131 veya anormal davran\u0131\u015flar\u0131 tespit eder ve uyar\u0131lar \u00fcretir. IPS ise bu tespitleri bir ad\u0131m \u00f6teye ta\u015f\u0131yarak, tehdit olarak alg\u0131lad\u0131\u011f\u0131 trafi\u011fi aktif olarak engeller. Snort veya Suricata gibi a\u00e7\u0131k kaynakl\u0131 IDS\/IPS \u00e7\u00f6z\u00fcmleri, g\u00fcvenlik duvar\u0131 ile entegre \u00e7al\u0131\u015farak sunucunuza y\u00f6nelik daha karma\u015f\u0131k sald\u0131r\u0131lar\u0131 tespit edip \u00f6nleyebilir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Guvenlik-Duvari-Gunluklerinin-Log-Izlenmesi-ve-Analizinin-Onemi\"><\/span>G\u00fcvenlik Duvar\u0131 G\u00fcnl\u00fcklerinin (Log) \u0130zlenmesi ve Analizinin \u00d6nemi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>G\u00fcvenlik duvar\u0131n\u0131z, engelledi\u011fi veya izin verdi\u011fi ba\u011flant\u0131lar hakk\u0131nda detayl\u0131 g\u00fcnl\u00fck kay\u0131tlar\u0131 (log) tutar. Bu loglar, bir alt\u0131n madeni de\u011ferindedir. G\u00fcnl\u00fckleri d\u00fczenli olarak izlemek ve analiz etmek, sunucunuza y\u00f6nelik sald\u0131r\u0131 giri\u015fimlerinin t\u00fcr\u00fcn\u00fc, s\u0131kl\u0131\u011f\u0131n\u0131 ve kayna\u011f\u0131n\u0131 anlaman\u0131za yard\u0131mc\u0131 olur. Anormal bir aktivite (\u00f6rne\u011fin, belirli bir \u00fclkeden gelen yo\u011fun port taramas\u0131) fark etti\u011finizde, g\u00fcvenlik duvar\u0131 kurallar\u0131n\u0131z\u0131 bu yeni tehdide g\u00f6re g\u00fcncelleyebilirsiniz. Log analizi, reaktif bir g\u00fcvenlik \u00f6nlemi olman\u0131n \u00f6tesinde, proaktif bir savunma stratejisi geli\u015ftirmenize olanak tan\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Kullanilmayan-Portlarin-ve-Servislerin-Kapatilmasi\"><\/span>Kullan\u0131lmayan Portlar\u0131n ve Servislerin Kapat\u0131lmas\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Sunucu g\u00fcvenli\u011finin en temel kurallar\u0131ndan biri, sald\u0131r\u0131 y\u00fczeyini en aza indirmektir. Bu, sunucunuzda gereksiz yere \u00e7al\u0131\u015fan her t\u00fcrl\u00fc servis ve uygulaman\u0131n devre d\u0131\u015f\u0131 b\u0131rak\u0131lmas\u0131 veya kald\u0131r\u0131lmas\u0131 anlam\u0131na gelir. `netstat -tulnp` gibi bir komutla sunucunuzda hangi portlar\u0131n dinlemede oldu\u011funu kontrol edin. E\u011fer bir servisin ne i\u015fe yarad\u0131\u011f\u0131n\u0131 bilmiyorsan\u0131z veya aktif olarak kullanm\u0131yorsan\u0131z, onu kapat\u0131n. Kullan\u0131lmayan her servis, kapat\u0131lmam\u0131\u015f bir kap\u0131 gibidir ve potansiyel bir g\u00fcvenlik a\u00e7\u0131\u011f\u0131 olu\u015fturur.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Windows-VPS-icin-Guvenlik-Duvari-ve-Port-Yonetimi\"><\/span>Windows VPS i\u00e7in G\u00fcvenlik Duvar\u0131 ve Port Y\u00f6netimi<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>G\u00fcvenlik duvar\u0131 ve port korumas\u0131 sadece Linux sunuculara \u00f6zg\u00fc de\u011fildir. Windows Server i\u015fletim sistemleri de g\u00fc\u00e7l\u00fc ve esnek bir yerle\u015fik g\u00fcvenlik duvar\u0131 \u00e7\u00f6z\u00fcm\u00fcne sahiptir. Bu b\u00f6l\u00fcmde, Windows VPS kullan\u0131c\u0131lar\u0131 i\u00e7in g\u00fcvenlik duvar\u0131 y\u00f6netimine odaklanaca\u011f\u0131z. <a href=\"https:\/\/www.ihs.com.tr\/web-hosting\/windows-hosting.html\" target=\"_blank\">Windows Hosting<\/a> servislerinde de bu ad\u0131mlar \u00f6nemlidir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Windows-Defender-Gelismis-Guvenlik-Duvarina-Giris\"><\/span>Windows Defender Geli\u015fmi\u015f G\u00fcvenlik Duvar\u0131&#8217;na Giri\u015f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Windows Server i\u015fletim sistemlerinde yerle\u015fik olarak gelen &#8220;Geli\u015fmi\u015f G\u00fcvenlik \u00d6zelliklerine Sahip Windows Defender G\u00fcvenlik Duvar\u0131&#8221; (Windows Defender Firewall with Advanced Security), hem gelen hem de giden trafi\u011fi kontrol etmek i\u00e7in kapsaml\u0131 bir kural tabanl\u0131 sistem sunar. Bu ara\u00e7, basit port engellemenin \u00f6tesinde, belirli programlara, servislere, kullan\u0131c\u0131lara ve bilgisayarlara g\u00f6re \u00e7ok detayl\u0131 kurallar olu\u015fturman\u0131za olanak tan\u0131r. Durum bilgisi olan (stateful) bir g\u00fcvenlik duvar\u0131d\u0131r, yani giden bir iste\u011fe yan\u0131t olarak gelen me\u015fru trafi\u011fi otomatik olarak tan\u0131r ve izin verir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Gelen-Inbound-ve-Giden-Outbound-Kurallari-Olusturma\"><\/span>Gelen (Inbound) ve Giden (Outbound) Kurallar\u0131 Olu\u015fturma<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Windows G\u00fcvenlik Duvar\u0131 y\u00f6netim konsolunda, kurallar &#8220;Gelen Kurallar\u0131&#8221; (Inbound Rules) ve &#8220;Giden Kurallar\u0131&#8221; (Outbound Rules) olarak iki ana kategoriye ayr\u0131l\u0131r. Linux&#8217;taki &#8220;Default Deny&#8221; politikas\u0131na benzer \u015fekilde, en g\u00fcvenli yap\u0131land\u0131rma, varsay\u0131lan olarak t\u00fcm gelen ba\u011flant\u0131lar\u0131 engellemek ve sadece ihtiya\u00e7 duyulan servislere \u00f6zel kurallar olu\u015fturarak izin vermektir. Yeni bir kural olu\u015ftururken, sihirbaz sizi ad\u0131m ad\u0131m y\u00f6nlendirir:<\/p>\n<ul>\n<li><b>Kural T\u00fcr\u00fc:<\/b> Kural\u0131n bir program m\u0131, port mu, \u00f6nceden tan\u0131mlanm\u0131\u015f bir servis mi yoksa \u00f6zel mi olaca\u011f\u0131n\u0131 se\u00e7ersiniz.<\/li>\n<li><b>Program\/Port:<\/b> Se\u00e7iminize g\u00f6re, kural\u0131n uygulanaca\u011f\u0131 program\u0131n yolunu veya belirli TCP\/UDP port numaralar\u0131n\u0131 belirtirsiniz.<\/li>\n<li><b>Eylem:<\/b> Ba\u011flant\u0131ya izin ver (Allow), ba\u011flant\u0131y\u0131 engelle (Block) veya yaln\u0131zca g\u00fcvenli ise izin ver (Allow if it is secure &#8211; IPsec) se\u00e7eneklerinden birini se\u00e7ersiniz.<\/li>\n<li><b>Profil:<\/b> Kural\u0131n hangi a\u011f profillerinde (Etki Alan\u0131, \u00d6zel, Ortak) ge\u00e7erli olaca\u011f\u0131n\u0131 belirlersiniz.<\/li>\n<li><b>Ad ve A\u00e7\u0131klama:<\/b> Kural\u0131 daha sonra kolayca tan\u0131yabilmek i\u00e7in bir ad ve a\u00e7\u0131klama girersiniz.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Belirli-Portlari-Programlari-ve-Servisleri-Yonetme\"><\/span>Belirli Portlar\u0131, Programlar\u0131 ve Servisleri Y\u00f6netme<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Windows G\u00fcvenlik Duvar\u0131&#8217;n\u0131n en g\u00fc\u00e7l\u00fc yanlar\u0131ndan biri, kurallar\u0131 sadece port numaralar\u0131na g\u00f6re de\u011fil, do\u011frudan uygulamalara ve servislere g\u00f6re de olu\u015fturabilme esnekli\u011fidir. \u00d6rne\u011fin, Microsoft SQL Server&#8217;a eri\u015fim izni vermek i\u00e7in sadece TCP 1433 portunu a\u00e7mak yerine, do\u011frudan SQL Server program\u0131n\u0131n (`sqlservr.exe`) a\u011f trafi\u011fine izin veren bir kural olu\u015fturabilirsiniz. Bu, e\u011fer ileride SQL Server farkl\u0131 bir port kullanacak \u015fekilde yap\u0131land\u0131r\u0131l\u0131rsa, g\u00fcvenlik duvar\u0131 kural\u0131n\u0131n otomatik olarak adapte olmas\u0131n\u0131 sa\u011flar. Bu y\u00f6ntem, port tabanl\u0131 kurallara g\u00f6re daha g\u00fcvenli ve y\u00f6netimi daha kolayd\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Windows-Sunucularda-Port-Guvenligi-icin-Pratik-Ipuclari\"><\/span>Windows Sunucularda Port G\u00fcvenli\u011fi i\u00e7in Pratik \u0130pu\u00e7lar\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><b>Uzak Masa\u00fcst\u00fc (RDP) Portunu De\u011fi\u015ftirin:<\/b> T\u0131pk\u0131 Linux&#8217;taki SSH gibi, Windows&#8217;taki RDP (Uzak Masa\u00fcst\u00fc Protokol\u00fc) de varsay\u0131lan 3389 portu \u00fczerinden s\u00fcrekli sald\u0131r\u0131 al\u0131r. Bu portu standart d\u0131\u015f\u0131 bir porta de\u011fi\u015ftirmek, otomatik sald\u0131r\u0131lar\u0131 b\u00fcy\u00fck \u00f6l\u00e7\u00fcde azalt\u0131r.<\/li>\n<li><b>Kullan\u0131lmayan Servisleri Devre D\u0131\u015f\u0131 B\u0131rak\u0131n:<\/b> &#8220;services.msc&#8221; konsolunu kullanarak sunucunuzda \u00e7al\u0131\u015fan t\u00fcm servisleri listeleyin. \u0130htiya\u00e7 duymad\u0131\u011f\u0131n\u0131z (\u00f6rne\u011fin, &#8220;Print Spooler&#8221; veya &#8220;Fax&#8221;) servisleri durdurun ve ba\u015flang\u0131\u00e7 t\u00fcr\u00fcn\u00fc &#8220;Devre D\u0131\u015f\u0131&#8221; olarak ayarlay\u0131n.<\/li>\n<li><b>A\u011f Profillerini Do\u011fru Kullan\u0131n:<\/b> Sunucunuzun a\u011f ba\u011flant\u0131s\u0131 i\u00e7in &#8220;Ortak&#8221; (Public) profilini kullanmak, dosya ve yaz\u0131c\u0131 payla\u015f\u0131m\u0131 gibi potansiyel olarak riskli \u00f6zellikleri otomatik olarak devre d\u0131\u015f\u0131 b\u0131rakarak daha k\u0131s\u0131tlay\u0131c\u0131 bir g\u00fcvenlik duvar\u0131 kural seti uygular.<\/li>\n<li><b>G\u00fcvenlik G\u00fcnl\u00fcklerini \u0130zleyin:<\/b> Olay G\u00f6r\u00fcnt\u00fcleyicisi (Event Viewer) alt\u0131nda &#8220;Windows G\u00fcnl\u00fckleri > G\u00fcvenlik&#8221; b\u00f6l\u00fcm\u00fcn\u00fc d\u00fczenli olarak kontrol ederek engellenen ba\u011flant\u0131 giri\u015fimlerini ve olas\u0131 sald\u0131r\u0131 denemelerini izleyin.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"VPS-Guvenlik-Duvari-ve-Port-Korumasi-Icin-Neden-IHS-Telekomu-Tercih-Etmelisiniz\"><\/span>VPS G\u00fcvenlik Duvar\u0131 ve Port Korumas\u0131 \u0130\u00e7in Neden \u0130HS Telekom&#8217;u Tercih Etmelisiniz?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Sunucu g\u00fcvenli\u011fi, do\u011fru yaz\u0131l\u0131m ve yap\u0131land\u0131rmalar\u0131n yan\u0131 s\u0131ra, hizmet ald\u0131\u011f\u0131n\u0131z sa\u011flay\u0131c\u0131n\u0131n sundu\u011fu altyap\u0131 ve destek kalitesiyle de do\u011frudan ili\u015fkilidir. G\u00fc\u00e7l\u00fc bir g\u00fcvenlik duvar\u0131 stratejisi, g\u00fcvenilir bir temel \u00fczerine in\u015fa edildi\u011finde en etkili hale gelir. \u0130HS Telekom, VPS hizmetlerinde g\u00fcvenlik ve performans\u0131 \u00f6n planda tutarak kullan\u0131c\u0131lar\u0131na kapsaml\u0131 \u00e7\u00f6z\u00fcmler sunar.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Gelismis-Ag-Guvenligi-Altyapisi-ve-Standart-DDoS-Korumasi\"><\/span>Geli\u015fmi\u015f A\u011f G\u00fcvenli\u011fi Altyap\u0131s\u0131 ve Standart DDoS Korumas\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Bir VPS&#8217;nin g\u00fcvenli\u011fi, sadece i\u015fletim sistemi seviyesinde ba\u015flamaz. \u0130HS Telekom, a\u011f altyap\u0131s\u0131n\u0131 en ba\u015f\u0131ndan itibaren g\u00fcvenlik odakl\u0131 tasarlar. T\u00fcm sunucu hizmetlerinde standart olarak sunulan geli\u015fmi\u015f DDoS (Distributed Denial of Service) korumas\u0131, sunucunuza y\u00f6nelik b\u00fcy\u00fck \u00f6l\u00e7ekli trafik sald\u0131r\u0131lar\u0131n\u0131 daha size ula\u015fmadan a\u011f seviyesinde filtreleyerek hizmetlerinizin kesintisiz devam etmesini sa\u011flar. Bu, bireysel olarak y\u00f6netebilece\u011finiz yaz\u0131l\u0131m tabanl\u0131 g\u00fcvenlik duvarlar\u0131n\u0131n ba\u015fa \u00e7\u0131kamayaca\u011f\u0131 tehditlere kar\u015f\u0131 ilk ve en \u00f6nemli savunma hatt\u0131n\u0131 olu\u015fturur.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Kolay-Yonetim-Panelleri-Uzerinden-Guvenlik-Duvari-Kontrolu\"><\/span>Kolay Y\u00f6netim Panelleri \u00dczerinden G\u00fcvenlik Duvar\u0131 Kontrol\u00fc<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Komut sat\u0131r\u0131 herkes i\u00e7in ideal olmayabilir. \u0130HS Telekom, m\u00fc\u015fterilerine sundu\u011fu cPanel veya Plesk gibi kullan\u0131c\u0131 dostu kontrol panelleri arac\u0131l\u0131\u011f\u0131yla temel g\u00fcvenlik duvar\u0131 ayarlar\u0131n\u0131 kolayca y\u00f6netme imkan\u0131 sunar. Bu paneller, karma\u015f\u0131k komutlara ihtiya\u00e7 duymadan belirli portlar\u0131 a\u00e7\u0131p kapatman\u0131za veya IP adreslerini engellemenize olanak tan\u0131yan grafik aray\u00fczler sa\u011flar. Bu sayede, teknik bilgisi daha az olan kullan\u0131c\u0131lar bile sunucular\u0131n\u0131n temel g\u00fcvenli\u011fini kolayca sa\u011flayabilir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"724-Uzman-Teknik-Destek-ile-Guvenlik-Sorunlarina-Hizli-Cozumler\"><\/span>7\/24 Uzman Teknik Destek ile G\u00fcvenlik Sorunlar\u0131na H\u0131zl\u0131 \u00c7\u00f6z\u00fcmler<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>G\u00fcvenlik d\u00fcnyas\u0131nda zamanlama kritiktir. Bir g\u00fcvenlik a\u00e7\u0131\u011f\u0131 veya sald\u0131r\u0131 durumuyla kar\u015f\u0131la\u015ft\u0131\u011f\u0131n\u0131zda, an\u0131nda m\u00fcdahale edebilecek uzman bir ekibe ula\u015fabilmek hayati \u00f6nem ta\u015f\u0131r. \u0130HS Telekom, 7\/24 hizmet veren uzman teknik destek ekibi ile olas\u0131 g\u00fcvenlik sorunlar\u0131n\u0131zda, g\u00fcvenlik duvar\u0131 yap\u0131land\u0131rman\u0131zda veya anormal bir aktiviteyi analiz etmede size h\u0131zl\u0131 ve etkili bir \u015fekilde yard\u0131mc\u0131 olur. Yaln\u0131z olmad\u0131\u011f\u0131n\u0131z\u0131 bilmek, sunucu y\u00f6netiminde b\u00fcy\u00fck bir g\u00fcvence sa\u011flar.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Yuksek-Performansli-ve-Guvenilir-Sunucu-Altyapisi\"><\/span>Y\u00fcksek Performansl\u0131 ve G\u00fcvenilir Sunucu Altyap\u0131s\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>G\u00fcvenlik yaz\u0131l\u0131mlar\u0131, \u00f6zellikle IDS\/IPS gibi \u00e7\u00f6z\u00fcmler, sunucu kaynaklar\u0131n\u0131 kullanabilir. \u0130HS Telekom&#8217;un y\u00fcksek performansl\u0131 donan\u0131mlar ve optimize edilmi\u015f sanalla\u015ft\u0131rma altyap\u0131s\u0131 \u00fczerine kurulu VPS ve <a href=\"https:\/\/www.ihs.com.tr\/sunucu-kiralama\/vds-sunucu.html\" target=\"_blank\">VDS<\/a> sunucular\u0131, g\u00fcvenlik \u00f6nlemlerini \u00e7al\u0131\u015ft\u0131r\u0131rken bile web sitelerinizin ve uygulamalar\u0131n\u0131z\u0131n performans\u0131ndan \u00f6d\u00fcn vermemenizi sa\u011flar. G\u00fcvenilir ve kesintisiz \u00e7al\u0131\u015fan bir altyap\u0131, g\u00fcvenlik g\u00fcncellemelerini zaman\u0131nda yapabilmeniz ve sunucunuzu her zaman en g\u00fcncel ve korunakl\u0131 durumda tutabilmeniz i\u00e7in gerekli zemini haz\u0131rlar. Bir <a href=\"https:\/\/www.ihs.com.tr\/domain\/alan-adi-domain-tescili.html\" target=\"_blank\">alan ad\u0131<\/a> tescil edip, g\u00fc\u00e7l\u00fc bir <a href=\"https:\/\/www.ihs.com.tr\/web-hosting\/\" target=\"_blank\">hosting<\/a> altyap\u0131s\u0131yla projenizi hayata ge\u00e7irirken, g\u00fcvenli\u011fin de en az performans kadar \u00f6nemli oldu\u011funu unutmamak gerekir.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dijital d\u00fcnyada varl\u0131k g\u00f6steren her projenin ve i\u015fletmenin temelini olu\u015fturan sunucular, ayn\u0131 zamanda siber sald\u0131r\u0131lar\u0131n da birincil hedefidir. \u00d6zellikle esneklik ve performans&hellip;<\/p>\n","protected":false},"author":3,"featured_media":16544,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[414],"tags":[],"class_list":["post-16543","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sunucu"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/posts\/16543","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/comments?post=16543"}],"version-history":[{"count":1,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/posts\/16543\/revisions"}],"predecessor-version":[{"id":16545,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/posts\/16543\/revisions\/16545"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/media\/16544"}],"wp:attachment":[{"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/media?parent=16543"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/categories?post=16543"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/tags?post=16543"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}