{"id":122,"date":"2026-02-17T18:28:26","date_gmt":"2026-02-17T18:28:26","guid":{"rendered":"https:\/\/perminet.com\/blog\/?p=122"},"modified":"2026-02-17T18:28:28","modified_gmt":"2026-02-17T18:28:28","slug":"firewall-kurallari-yanlissa-ne-olur","status":"publish","type":"post","link":"https:\/\/perminet.com\/blog\/firewall-kurallari-yanlissa-ne-olur\/","title":{"rendered":"Firewall Kurallar\u0131 Yanl\u0131\u015fsa Ne Olur?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Sunucuya SSH ile ba\u011flanmaya \u00e7al\u0131\u015f\u0131yorsunuz. Ba\u011flant\u0131 yok.<br>Ping at\u0131yorsunuz, cevap geliyor.<br>Web sitesi a\u00e7\u0131k ama admin paneline eri\u015femiyorsunuz.<br>Ya da tam tersi: Her \u015fey a\u00e7\u0131k, ama asl\u0131nda olmas\u0131 gerekenden fazla a\u00e7\u0131k.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Firewall \u00e7al\u0131\u015f\u0131yor ama do\u011fru \u00e7al\u0131\u015fm\u0131yor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">10 y\u0131l\u0131 a\u015fk\u0131n s\u00fcredir sistem y\u00f6netimi yap\u0131yorum. \u00c7\u00f6ken sunucular\u0131n, hacklenen sitelerin, saatlerce kapal\u0131 kalan e-ticaret projelerinin \u00e7o\u011funda ortak bir \u015fey g\u00f6rd\u00fcm: <strong>Yanl\u0131\u015f yaz\u0131lm\u0131\u015f firewall kurallar\u0131.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Firewall \u201cvar\u201d olmas\u0131yla g\u00fcvenli olmaz.<br>Nas\u0131l konfig\u00fcre edildi\u011fi belirleyicidir.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Yanl\u0131\u015f firewall kural\u0131 ger\u00e7ekten neye yol a\u00e7ar?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Firewall hatalar\u0131 genelde iki \u015fekilde kar\u015f\u0131m\u0131za \u00e7\u0131kar:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>A\u015f\u0131r\u0131 k\u0131s\u0131tlama (overblocking)<\/strong><\/li>\n\n\n\n<li><strong>Gere\u011finden fazla a\u00e7\u0131kl\u0131k (underblocking)<\/strong><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130kisi de risklidir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\u015f\u0131r\u0131 k\u0131s\u0131tlama:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ger\u00e7ek kullan\u0131c\u0131 eri\u015femez<\/li>\n\n\n\n<li>API servisleri \u00e7al\u0131\u015fmaz<\/li>\n\n\n\n<li>\u00d6deme sistemleri timeout verir<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Gere\u011finden fazla a\u00e7\u0131kl\u0131k:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gereksiz portlar a\u00e7\u0131k kal\u0131r<\/li>\n\n\n\n<li>Brute force denemeleri artar<\/li>\n\n\n\n<li>Sunucu taramalara a\u00e7\u0131k olur<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Bir firewall kural\u0131 yanl\u0131\u015f yaz\u0131ld\u0131\u011f\u0131nda sistem ya kilitlenir ya da savunmas\u0131z kal\u0131r. Ortas\u0131 yoktur.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Ger\u00e7ek bir senaryo: \u201cSadece 22. portu kapatt\u0131k\u201d<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bir m\u00fc\u015fteride ya\u015fad\u0131\u011f\u0131m olay.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sunucuya brute force sald\u0131r\u0131s\u0131 geliyordu. \u00c7\u00f6z\u00fcm olarak \u015fu yap\u0131ld\u0131:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c22. portu kapatal\u0131m.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ama yap\u0131lan \u015fey \u015fu oldu:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>iptables -A INPUT -p tcp --dport 22 -j DROP\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sorun \u015fu:<br>Sunucuya sadece SSH de\u011fil, SFTP ve baz\u0131 otomasyon servisleri de 22 \u00fczerinden ba\u011flan\u0131yordu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sonu\u00e7?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Otomatik yedekleme sistemi durdu<\/li>\n\n\n\n<li>CI\/CD deployment kesildi<\/li>\n\n\n\n<li>Monitoring ajan\u0131 ba\u011flant\u0131 kuramad\u0131<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">3 g\u00fcn boyunca yedek al\u0131nmad\u0131. Kimse fark etmedi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Firewall sald\u0131r\u0131y\u0131 durdurdu ama operasyonu da durdurdu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As\u0131l yap\u0131lmas\u0131 gereken:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IP whitelist<\/li>\n\n\n\n<li>Fail2ban<\/li>\n\n\n\n<li>Rate limiting<\/li>\n\n\n\n<li>SSH key zorunlulu\u011fu<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">K\u00f6rlemesine port kapatmak de\u011fil.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Firewall kurallar\u0131 neden s\u0131k hata verir?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c7\u00fcnk\u00fc \u00e7o\u011fu zaman \u015fu hatalar yap\u0131l\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Test ortam\u0131nda denenmeden production\u2019a uygulan\u0131r<\/li>\n\n\n\n<li>Mevcut servis ba\u011f\u0131ml\u0131l\u0131klar\u0131 analiz edilmez<\/li>\n\n\n\n<li>Kural s\u0131ras\u0131 dikkate al\u0131nmaz<\/li>\n\n\n\n<li>\u201cDROP all\u201d en \u00fcste yaz\u0131l\u0131r<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u00d6zellikle iptables ve benzeri sistemlerde <strong>kural s\u0131ras\u0131<\/strong> hayati \u00f6nem ta\u015f\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c7o\u011fu ki\u015finin bilmedi\u011fi teknik detay:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Firewall\u2019lar kurallar\u0131 yukar\u0131dan a\u015fa\u011f\u0131ya okur. \u0130lk e\u015fle\u015fen kural uygulan\u0131r.<br>Yani en \u00fcste yazd\u0131\u011f\u0131n\u0131z genel bir DROP kural\u0131, alt\u0131ndaki t\u00fcm allow kurallar\u0131n\u0131 anlams\u0131z hale getirebilir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bu y\u00fczden \u015fu yap\u0131 kritik \u00f6nemdedir:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u0130zin verilen spesifik trafik<\/li>\n\n\n\n<li>Gerekli servis portlar\u0131<\/li>\n\n\n\n<li>Son sat\u0131rda genel DROP<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Tersini yaparsan\u0131z sistem kendini kilitler.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Yanl\u0131\u015f firewall yap\u0131land\u0131rmas\u0131 g\u00fcvenlik a\u00e7\u0131\u011f\u0131 yarat\u0131r m\u0131?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Kesinlikle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En s\u0131k g\u00f6rd\u00fc\u011f\u00fcm yanl\u0131\u015flar:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>3306 (MySQL) portunun internete a\u00e7\u0131k b\u0131rak\u0131lmas\u0131<\/li>\n\n\n\n<li>6379 (Redis) portunun korumas\u0131z olmas\u0131<\/li>\n\n\n\n<li>9200 (Elasticsearch) portunun public olmas\u0131<\/li>\n\n\n\n<li>T\u00fcm d\u00fcnyaya a\u00e7\u0131k admin paneli<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Bir\u00e7ok veri s\u0131z\u0131nt\u0131s\u0131 bu basit hatalardan \u00e7\u0131kar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Firewall kural\u0131 yanl\u0131\u015fsa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bot taramalar\u0131 artar<\/li>\n\n\n\n<li>Log dosyalar\u0131 dolar<\/li>\n\n\n\n<li>CPU gereksiz yere me\u015fgul olur<\/li>\n\n\n\n<li>DDoS etkisi b\u00fcy\u00fcr<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Yani firewall hatas\u0131 sadece g\u00fcvenlik de\u011fil, performans sorunu da yarat\u0131r.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Do\u011fru firewall ile yanl\u0131\u015f firewall aras\u0131ndaki fark nedir?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A\u015fa\u011f\u0131daki tablo sahadaki fark\u0131 net g\u00f6sterir:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u00d6zellik<\/th><th>Yanl\u0131\u015f Yap\u0131land\u0131r\u0131lm\u0131\u015f Firewall<\/th><th>Do\u011fru Yap\u0131land\u0131r\u0131lm\u0131\u015f Firewall<\/th><\/tr><\/thead><tbody><tr><td>Gereksiz portlar<\/td><td>A\u00e7\u0131k kal\u0131r<\/td><td>Kapal\u0131<\/td><\/tr><tr><td>SSH eri\u015fimi<\/td><td>Herkese a\u00e7\u0131k<\/td><td>IP bazl\u0131 k\u0131s\u0131tl\u0131<\/td><\/tr><tr><td>Kural s\u0131ras\u0131<\/td><td>Rastgele<\/td><td>Planl\u0131<\/td><\/tr><tr><td>Logging<\/td><td>Kapal\u0131<\/td><td>Aktif<\/td><\/tr><tr><td>Rate limit<\/td><td>Yok<\/td><td>Var<\/td><\/tr><tr><td>Servis ba\u011f\u0131ml\u0131l\u0131klar\u0131<\/td><td>Analiz edilmemi\u015f<\/td><td>Haritalanm\u0131\u015f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Firewall sadece \u201ckapal\u0131 port\u201d demek de\u011fildir.<br>Planl\u0131 eri\u015fim kontrol\u00fc demektir.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">K\u00fc\u00e7\u00fck i\u015fletmelerde en s\u0131k yap\u0131lan firewall hatalar\u0131 nelerdir?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u015eunlar\u0131 \u00e7ok g\u00f6rd\u00fcm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201cHer \u015feyi kapatal\u0131m\u201d yakla\u015f\u0131m\u0131<\/li>\n\n\n\n<li>Ya da tam tersi \u201cHosting firmas\u0131 zaten g\u00fcvenli\u201d d\u00fc\u015f\u00fcncesi<\/li>\n\n\n\n<li>Default konfig\u00fcrasyonla devam etmek<\/li>\n\n\n\n<li>Monitoring olmamas\u0131<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u00d6zellikle payla\u015f\u0131ml\u0131 veya d\u00fc\u015f\u00fck kaliteli altyap\u0131larda firewall yap\u0131land\u0131rmas\u0131 s\u0131n\u0131rl\u0131 olur. \u0130zole kaynak mimarisi olmayan ortamlarda bir m\u00fc\u015fterinin ald\u0131\u011f\u0131 sald\u0131r\u0131 di\u011ferlerini de etkileyebilir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bu nedenle altyap\u0131 se\u00e7imi \u00f6nemlidir. Performans ve g\u00fcvenlik dengesi kurmak gerekir. \u00d6zellikle dinamik projelerde ve e-ticaret sitelerinde, optimize edilmi\u015f ve g\u00fcvenli bir hosting altyap\u0131s\u0131 tercih edilmelidir. Detayl\u0131 bilgi i\u00e7in <a href=\"https:\/\/perminet.com\/web-hosting\">https:\/\/perminet.com\/web-hosting<\/a> sayfas\u0131na g\u00f6z atabilirsiniz.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Firewall tek ba\u015f\u0131na yeterli de\u011fildir. Altyap\u0131 da sa\u011flam olmal\u0131.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Firewall hatas\u0131 SEO\u2019yu etkiler mi?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Evet, hem de dolayl\u0131 yoldan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Yanl\u0131\u015f kural:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Google bot\u2019u engeller<\/li>\n\n\n\n<li>403 hatas\u0131 \u00fcretir<\/li>\n\n\n\n<li>5xx hatalar\u0131na sebep olur<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ya da tam tersi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spam botlar rahat girer<\/li>\n\n\n\n<li>Sunucu yava\u015flar<\/li>\n\n\n\n<li>Crawl s\u00fcresi uzar<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">SEO sadece i\u00e7erik i\u015fi de\u011fildir.<br>Stabil eri\u015fim ve do\u011fru eri\u015fim kontrol\u00fc gerekir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00d6zellikle \u201cfirewall Google bot\u2019u engelliyor mu?\u201d konusu \u00e7o\u011fu zaman g\u00f6zden ka\u00e7ar.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Firewall yap\u0131land\u0131r\u0131rken nelere dikkat etmelisiniz?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u015eunlar\u0131 yapmadan production\u2019a ge\u00e7meyin:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Servis haritas\u0131 \u00e7\u0131kar\u0131n (hangi servis hangi port?)<\/li>\n\n\n\n<li>IP whitelist plan\u0131 olu\u015fturun<\/li>\n\n\n\n<li>Staging ortam\u0131nda test edin<\/li>\n\n\n\n<li>Logging aktif olsun<\/li>\n\n\n\n<li>Failover plan\u0131n\u0131z olsun<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ve en \u00f6nemlisi:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cDROP ALL\u201d kural\u0131n\u0131 yazmadan \u00f6nce iki kez d\u00fc\u015f\u00fcn\u00fcn.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">S\u0131k Sorulan Sorular (FAQ)<\/h1>\n\n\n\n<h3 class=\"wp-block-heading\">Firewall kurallar\u0131 yanl\u0131\u015fsa site tamamen kapan\u0131r m\u0131?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Evet, m\u00fcmk\u00fcn.<br>Yanl\u0131\u015f yaz\u0131lm\u0131\u015f bir DROP kural\u0131 t\u00fcm inbound trafi\u011fi engelleyebilir.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Firewall sadece port kapatmak m\u0131d\u0131r?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hay\u0131r.<br>IP bazl\u0131 filtreleme, rate limiting, stateful kontrol gibi bir\u00e7ok fonksiyon i\u00e7erir.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Hosting firmas\u0131 firewall sa\u011fl\u0131yorsa ekstra yap\u0131land\u0131rma gerekir mi?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Genelde evet.<br>Varsay\u0131lan kurallar her projeye uygun de\u011fildir.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Yanl\u0131\u015f firewall performans\u0131 etkiler mi?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Evet.<br>A\u00e7\u0131k b\u0131rak\u0131lm\u0131\u015f gereksiz portlar ve log yo\u011funlu\u011fu CPU t\u00fcketimini art\u0131rabilir.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Firewall ile WAF ayn\u0131 \u015fey midir?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hay\u0131r.<br>Firewall network seviyesinde \u00e7al\u0131\u015f\u0131r.<br>WAF uygulama katman\u0131nda \u00e7al\u0131\u015f\u0131r.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Firewall kurallar\u0131 k\u00fc\u00e7\u00fck detay gibi g\u00f6r\u00fcn\u00fcr. Ama k\u00fc\u00e7\u00fck bir hata saatlerce eri\u015fim kayb\u0131na, hatta veri ihlaline yol a\u00e7abilir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">G\u00fcvenlik \u201ckurduk bitti\u201d meselesi de\u011fildir.<br>Do\u011fru planlama, do\u011fru s\u0131ra ve do\u011fru test ile anlam kazan\u0131r.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sunucuya SSH ile ba\u011flanmaya \u00e7al\u0131\u015f\u0131yorsunuz. Ba\u011flant\u0131 yok.Ping at\u0131yorsunuz, cevap geliyor.Web sitesi a\u00e7\u0131k ama admin paneline eri\u015femiyorsunuz.Ya da tam tersi: Her \u015fey a\u00e7\u0131k, ama asl\u0131nda olmas\u0131 gerekenden fazla a\u00e7\u0131k. Firewall \u00e7al\u0131\u015f\u0131yor&#8230;<\/p>\n","protected":false},"author":2,"featured_media":123,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[41,16,33],"class_list":["post-122","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-genel","tag-firewall","tag-hosting","tag-sunucu"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Firewall Kurallar\u0131 Yanl\u0131\u015fsa Ne Olur? - Perminet<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/perminet.com\/blog\/firewall-kurallari-yanlissa-ne-olur\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Firewall Kurallar\u0131 Yanl\u0131\u015fsa Ne Olur? - Perminet\" \/>\n<meta property=\"og:description\" content=\"Sunucuya SSH ile ba\u011flanmaya \u00e7al\u0131\u015f\u0131yorsunuz. Ba\u011flant\u0131 yok.Ping at\u0131yorsunuz, cevap geliyor.Web sitesi a\u00e7\u0131k ama admin paneline eri\u015femiyorsunuz.Ya da tam tersi: Her \u015fey a\u00e7\u0131k, ama asl\u0131nda olmas\u0131 gerekenden fazla a\u00e7\u0131k. 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