{"id":23776,"date":"2026-08-03T01:53:04","date_gmt":"2026-08-02T22:53:04","guid":{"rendered":"https:\/\/www.cenuta.com\/blog\/?p=23776"},"modified":"2026-08-03T01:53:05","modified_gmt":"2026-08-02T22:53:05","slug":"err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026","status":"publish","type":"post","link":"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/","title":{"rendered":"ERR_SSL_VERSION_OR_CIPHER_MISMATCH Hatas\u0131 Nedir? Kesin \u00c7\u00f6z\u00fcm Y\u00f6ntemleri (2026)"},"content":{"rendered":"\n<p>\u0130nternette gezinirken veya kendi web sitenize giri\u015f yapmaya \u00e7al\u0131\u015f\u0131rken kar\u015f\u0131n\u0131za \u00e7\u0131kan devasa k\u0131rm\u0131z\u0131 bir uyar\u0131 ekran\u0131, dijital d\u00fcnyadaki en can s\u0131k\u0131c\u0131 deneyimlerden biridir. Taray\u0131c\u0131n\u0131z\u0131n adres \u00e7ubu\u011funa URL&#8217;yi yazars\u0131n\u0131z ve sayfan\u0131n a\u00e7\u0131lmas\u0131n\u0131 beklerken birdenbire <strong>&#8220;Bu site g\u00fcvenli bir ba\u011flant\u0131 sa\u011flayam\u0131yor&#8221;<\/strong> uyar\u0131s\u0131yla kar\u015f\u0131la\u015f\u0131rs\u0131n\u0131z. Alt k\u0131s\u0131mda ise karma\u015f\u0131k g\u00f6r\u00fcnen o me\u015fhur hata kodu yazar: <code>ERR_SSL_VERSION_OR_CIPHER_MISMATCH<\/code>.<\/p>\n\n\n\n<p>Bir\u00e7ok kullan\u0131c\u0131 bu hatay\u0131 g\u00f6rd\u00fc\u011f\u00fcnde cihaz\u0131na vir\u00fcs bula\u015ft\u0131\u011f\u0131n\u0131 veya web sitesinin tamamen \u00e7\u00f6kt\u00fc\u011f\u00fcn\u00fc d\u00fc\u015f\u00fcnerek pani\u011fe kap\u0131l\u0131r. Ancak ger\u00e7ekte bu durum, modern web taray\u0131c\u0131lar\u0131n\u0131n sizi g\u00fcvensiz bir ba\u011flant\u0131dan korumak i\u00e7in devreye soktu\u011fu koruyucu bir reflekstir.<\/p>\n\n\n\n<p>2026 y\u0131l\u0131n\u0131n siber g\u00fcvenlik standartlar\u0131nda, \u015fifrelenmemi\u015f (HTTP) veya eski \u015fifreleme y\u00f6ntemlerini kullanan web siteleri taray\u0131c\u0131lar taraf\u0131ndan kesin bir dille reddedilmektedir. Bu kapsaml\u0131 rehberde; bu karma\u015f\u0131k isimli SSL hatas\u0131n\u0131n tam olarak ne anlama geldi\u011fini, perde arkas\u0131nda (sunucu ile taray\u0131c\u0131 aras\u0131nda) nelerin ters gitti\u011fini ve hem bir web sitesi ziyaret\u00e7isi hem de bir site sahibi olarak bu sorunu nas\u0131l k\u00f6k\u00fcnden \u00e7\u00f6zebilece\u011finizi t\u00fcm teknik detaylar\u0131yla inceliyoruz.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0130\u00e7indekiler<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a8071ea13a0e\" 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-6a8071ea13a0e\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#ERR_SSL_VERSION_OR_CIPHER_MISMATCH_Ne_Anlama_Gelir_El_Sikisma_Krizi\" title=\"ERR_SSL_VERSION_OR_CIPHER_MISMATCH Ne Anlama Gelir? (El S\u0131k\u0131\u015fma Krizi)\">ERR_SSL_VERSION_OR_CIPHER_MISMATCH Ne Anlama Gelir? (El S\u0131k\u0131\u015fma Krizi)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#Ziyaretciler_Kullanicilar_Icin_Cozum_Yontemleri\" title=\"Ziyaret\u00e7iler (Kullan\u0131c\u0131lar) \u0130\u00e7in \u00c7\u00f6z\u00fcm Y\u00f6ntemleri\">Ziyaret\u00e7iler (Kullan\u0131c\u0131lar) \u0130\u00e7in \u00c7\u00f6z\u00fcm Y\u00f6ntemleri<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#1_Isletim_Sistemi_SSL_Durumunu_SSL_State_Temizlemek\" title=\"1. \u0130\u015fletim Sistemi SSL Durumunu (SSL State) Temizlemek\">1. \u0130\u015fletim Sistemi SSL Durumunu (SSL State) Temizlemek<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#2_Antivirus_ve_Guvenlik_Duvari_Engellerini_Asmak\" title=\"2. Antivir\u00fcs ve G\u00fcvenlik Duvar\u0131 Engellerini A\u015fmak\">2. Antivir\u00fcs ve G\u00fcvenlik Duvar\u0131 Engellerini A\u015fmak<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#3_QUIC_Protokolunu_Devre_Disi_Birakmak\" title=\"3. QUIC Protokol\u00fcn\u00fc Devre D\u0131\u015f\u0131 B\u0131rakmak\">3. QUIC Protokol\u00fcn\u00fc Devre D\u0131\u015f\u0131 B\u0131rakmak<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#Web_Sitesi_Sahipleri_Sunucu_Yoneticileri_Icin_Kesin_Cozumler\" title=\"Web Sitesi Sahipleri (Sunucu Y\u00f6neticileri) \u0130\u00e7in Kesin \u00c7\u00f6z\u00fcmler\">Web Sitesi Sahipleri (Sunucu Y\u00f6neticileri) \u0130\u00e7in Kesin \u00c7\u00f6z\u00fcmler<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#Adim_1_SSLLabs_ile_Derinlemesine_Analiz_Yapin\" title=\"Ad\u0131m 1: SSLLabs ile Derinlemesine Analiz Yap\u0131n\">Ad\u0131m 1: SSLLabs ile Derinlemesine Analiz Yap\u0131n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#Adim_2_Cloudflare_CDN_SSL_Ayarlarini_Optimize_Edin\" title=\"Ad\u0131m 2: Cloudflare (CDN) SSL Ayarlar\u0131n\u0131 Optimize Edin\">Ad\u0131m 2: Cloudflare (CDN) SSL Ayarlar\u0131n\u0131 Optimize Edin<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#Adim_3_Eski_TLS_10_ve_11_Protokollerini_Kapatin_TLS_12_ve_13u_Aktif_Edin\" title=\"Ad\u0131m 3: Eski TLS (1.0 ve 1.1) Protokollerini Kapat\u0131n, TLS 1.2 ve 1.3&#8217;\u00fc Aktif Edin\">Ad\u0131m 3: Eski TLS (1.0 ve 1.1) Protokollerini Kapat\u0131n, TLS 1.2 ve 1.3&#8217;\u00fc Aktif Edin<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#Adim_4_Guclu_Sifreleme_Setlerini_Cipher_Suites_Tanimlayin\" title=\"Ad\u0131m 4: G\u00fc\u00e7l\u00fc \u015eifreleme Setlerini (Cipher Suites) Tan\u0131mlay\u0131n\">Ad\u0131m 4: G\u00fc\u00e7l\u00fc \u015eifreleme Setlerini (Cipher Suites) Tan\u0131mlay\u0131n<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#Gelecekte_Bu_Hatayi_Yasamamasi_Icin_Altin_Kurallar\" title=\"Gelecekte Bu Hatay\u0131 Ya\u015famamas\u0131 \u0130\u00e7in Alt\u0131n Kurallar\">Gelecekte Bu Hatay\u0131 Ya\u015famamas\u0131 \u0130\u00e7in Alt\u0131n Kurallar<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/#Sonuc\" title=\"Sonu\u00e7\">Sonu\u00e7<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ERR_SSL_VERSION_OR_CIPHER_MISMATCH_Ne_Anlama_Gelir_El_Sikisma_Krizi\"><\/span>ERR_SSL_VERSION_OR_CIPHER_MISMATCH Ne Anlama Gelir? (El S\u0131k\u0131\u015fma Krizi)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Bu hatan\u0131n mant\u0131\u011f\u0131n\u0131 anlamak i\u00e7in, taray\u0131c\u0131n\u0131z (Google Chrome, Firefox, Safari) ile girmeye \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131z web sunucusu aras\u0131ndaki ileti\u015fimin nas\u0131l ba\u015flad\u0131\u011f\u0131n\u0131 bilmeniz gerekir. Bu s\u00fcrece siber g\u00fcvenlik literat\u00fcr\u00fcnde <strong>&#8220;SSL\/TLS Handshake&#8221; (El S\u0131k\u0131\u015fma)<\/strong> ad\u0131 verilir.<\/p>\n\n\n\n<p>Siz bir web sitesine girmek istedi\u011finizde, taray\u0131c\u0131n\u0131z sunucuya g\u00f6r\u00fcnmez bir &#8220;Merhaba&#8221; paketi g\u00f6nderir. Bu paketin i\u00e7inde \u015fu mesaj vard\u0131r: <em>&#8220;Merhaba, ben modern bir taray\u0131c\u0131y\u0131m. Ba\u011flant\u0131m\u0131z\u0131 \u015fifrelemek i\u00e7in TLS 1.3 veya en k\u00f6t\u00fc ihtimalle TLS 1.2 dillerini konu\u015fabilirim. Ayr\u0131ca kullanabilece\u011fim g\u00fc\u00e7l\u00fc \u015fifreleme algoritmalar\u0131n\u0131n (Cipher Suites) listesi de budur.&#8221;<\/em><\/p>\n\n\n\n<p>Sunucu bu mesaj\u0131 al\u0131r ve kendi kapasitesiyle kar\u015f\u0131la\u015ft\u0131r\u0131r. E\u011fer sunucu \u00e7ok eskiyse ve <em>&#8220;Ben sadece antika olan TLS 1.0 dilini konu\u015furum ve sadece eski RC4 \u015fifreleme algoritmas\u0131n\u0131 bilirim&#8221;<\/em> derse, taray\u0131c\u0131n\u0131z bu teklifi reddeder. \u00c7\u00fcnk\u00fc TLS 1.0 ve eski \u015fifreleme setleri, g\u00fcn\u00fcm\u00fcz hackerlar\u0131 taraf\u0131ndan saniyeler i\u00e7inde k\u0131r\u0131labilmektedir. Ortak bir g\u00fcvenlik dilinde (versiyon veya \u015fifreleme setinde) anla\u015f\u0131lamad\u0131\u011f\u0131 i\u00e7in el s\u0131k\u0131\u015fma i\u015flemi ba\u015far\u0131s\u0131z olur ve taray\u0131c\u0131 ekran\u0131n\u0131za <code>ERR_SSL_VERSION_OR_CIPHER_MISMATCH<\/code> (SSL Versiyonu veya \u015eifreleme Seti Uyu\u015fmazl\u0131\u011f\u0131) hatas\u0131n\u0131 basar.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ziyaretciler_Kullanicilar_Icin_Cozum_Yontemleri\"><\/span>Ziyaret\u00e7iler (Kullan\u0131c\u0131lar) \u0130\u00e7in \u00c7\u00f6z\u00fcm Y\u00f6ntemleri<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>E\u011fer bu hatay\u0131 kendi y\u00f6netti\u011finiz bir sitede de\u011fil de, ziyaret etmek istedi\u011finiz (\u00f6rne\u011fin bir \u00fcniversitenin eski otomasyon sistemi veya yabanc\u0131 bir blog) bir sitede al\u0131yorsan\u0131z, sorun b\u00fcy\u00fck ihtimalle kar\u015f\u0131 taraf\u0131n sunucusundad\u0131r. Ancak bazen bilgisayar\u0131n\u0131zdaki ayarlar da bu hatay\u0131 tetikleyebilir. \u00dcniversite \u00f6\u011frencisi <strong>Metehan<\/strong>, okuldaki eski bir makale ar\u015fivine girmek istedi\u011finde bu hatay\u0131 al\u0131r ve bilgisayar\u0131nda \u015fu ad\u0131mlar\u0131 uygulayarak sorunu kendi taraf\u0131nda \u00e7\u00f6zer:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Isletim_Sistemi_SSL_Durumunu_SSL_State_Temizlemek\"><\/span>1. \u0130\u015fletim Sistemi SSL Durumunu (SSL State) Temizlemek<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Bilgisayar\u0131n\u0131z, daha \u00f6nce girdi\u011finiz web sitelerinin SSL sertifika bilgilerini ba\u011flant\u0131y\u0131 h\u0131zland\u0131rmak i\u00e7in \u00f6nbellekte (cache) tutar. Bu \u00f6nbellek bozuldu\u011funda uyumsuzluk hatalar\u0131 ortaya \u00e7\u0131kar.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Windows Kullan\u0131c\u0131lar\u0131 \u0130\u00e7in:<\/strong> Ba\u015flat men\u00fcs\u00fcne &#8220;\u0130nternet Se\u00e7enekleri&#8221; yaz\u0131p a\u00e7\u0131n. \u00dcst sekmelerden <strong>\u0130\u00e7erik (Content)<\/strong> k\u0131sm\u0131na gelin ve <strong>SSL Durumunu Temizle (Clear SSL State)<\/strong> butonuna t\u0131klay\u0131n. \u0130\u015flem tamamland\u0131\u011f\u0131nda taray\u0131c\u0131n\u0131z\u0131 kapat\u0131p yeniden a\u00e7\u0131n.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Antivirus_ve_Guvenlik_Duvari_Engellerini_Asmak\"><\/span>2. Antivir\u00fcs ve G\u00fcvenlik Duvar\u0131 Engellerini A\u015fmak<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Modern antivir\u00fcs programlar\u0131, zararl\u0131 yaz\u0131l\u0131mlar\u0131 tespit etmek i\u00e7in bilgisayar\u0131n\u0131zla web sitesi aras\u0131ndaki &#8220;HTTPS&#8221; trafi\u011fini kendi \u00fczerlerinden ge\u00e7irerek tararlar (HTTPS Scanning). Bu tarama s\u0131ras\u0131nda antivir\u00fcs program\u0131n\u0131z, sitenin \u015fifreleme protokol\u00fcn\u00fc bozabilir.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u00c7\u00f6z\u00fcm:<\/strong> Kulland\u0131\u011f\u0131n\u0131z antivir\u00fcs program\u0131n\u0131n ayarlar\u0131na girin ve &#8220;HTTPS Taramas\u0131&#8221; (HTTPS Scanning veya Web Shield) \u00f6zelli\u011fini ge\u00e7ici olarak devre d\u0131\u015f\u0131 b\u0131rak\u0131n. Sayfa a\u00e7\u0131l\u0131yorsa, sorun antivir\u00fcs\u00fcn\u00fcz\u00fcn sertifika engellemesinden kaynaklan\u0131yordur.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_QUIC_Protokolunu_Devre_Disi_Birakmak\"><\/span>3. QUIC Protokol\u00fcn\u00fc Devre D\u0131\u015f\u0131 B\u0131rakmak<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Google Chrome, ba\u011flant\u0131lar\u0131 h\u0131zland\u0131rmak i\u00e7in standart protokoller yerine &#8220;QUIC&#8221; ad\u0131 verilen deneysel bir protokol kullanabilir. Ancak bu durum bazen SSL uyumsuzluklar\u0131na yol a\u00e7ar.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Chrome adres \u00e7ubu\u011funa <code>chrome:\/\/flags\/<\/code> yaz\u0131p Enter&#8217;a bas\u0131n.<\/li>\n\n\n\n<li>Arama kutusuna <code>QUIC<\/code> yaz\u0131n.<\/li>\n\n\n\n<li>\u00c7\u0131kan &#8220;Experimental QUIC protocol&#8221; se\u00e7ene\u011fini <strong>Disabled<\/strong> (Devre D\u0131\u015f\u0131) duruma getirin ve taray\u0131c\u0131y\u0131 yeniden ba\u015flat\u0131n.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Web_Sitesi_Sahipleri_Sunucu_Yoneticileri_Icin_Kesin_Cozumler\"><\/span>Web Sitesi Sahipleri (Sunucu Y\u00f6neticileri) \u0130\u00e7in Kesin \u00c7\u00f6z\u00fcmler<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>E\u011fer hatay\u0131 kendi web sitenizde al\u0131yorsan\u0131z, ziyaret\u00e7ilerinize &#8220;kendi bilgisayarlar\u0131n\u0131z\u0131n ayarlar\u0131n\u0131 de\u011fi\u015ftirin&#8221; diyemezsiniz. Sorunu k\u00f6k\u00fcnden, yani sunucu yap\u0131land\u0131rmas\u0131 \u00fczerinden \u00e7\u00f6zmeniz gerekir. \u0130\u015fte ad\u0131m ad\u0131m teknik m\u00fcdahale y\u00f6ntemleri:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Adim_1_SSLLabs_ile_Derinlemesine_Analiz_Yapin\"><\/span>Ad\u0131m 1: SSLLabs ile Derinlemesine Analiz Yap\u0131n<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Sorunun kayna\u011f\u0131n\u0131 ezbere aramak yerine, \u00f6nce sunucunuzun check-up&#8217;\u0131n\u0131 yapmal\u0131s\u0131n\u0131z. Ba\u011f\u0131ms\u0131z geli\u015ftirici <strong>Ceylin<\/strong>, yeni ta\u015f\u0131d\u0131\u011f\u0131 sunucusunda bu hatay\u0131 ald\u0131\u011f\u0131nda do\u011frudan <code>[ssllabs.com\/ssltest\/](https:\/\/ssllabs.com\/ssltest\/)<\/code> adresine gider ve web sitesinin URL&#8217;sini yazarak \u00fccretsiz bir tarama ba\u015flat\u0131r. Tarama sonucunda Ceylin, sunucusunun &#8220;B&#8221; notu ald\u0131\u011f\u0131n\u0131 ve k\u0131rm\u0131z\u0131 harflerle <em>\u201cThis server supports TLS 1.0 and TLS 1.1\u201d<\/em> uyar\u0131s\u0131n\u0131n belirdi\u011fini g\u00f6r\u00fcr. SSLLabs raporu size hangi eski \u015fifreleme dillerinin a\u00e7\u0131k kald\u0131\u011f\u0131n\u0131 net bir \u015fekilde g\u00f6sterecektir.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Adim_2_Cloudflare_CDN_SSL_Ayarlarini_Optimize_Edin\"><\/span>Ad\u0131m 2: Cloudflare (CDN) SSL Ayarlar\u0131n\u0131 Optimize Edin<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>G\u00fcn\u00fcm\u00fczde bu hatan\u0131n a\u00e7\u0131k ara en \u00e7ok kar\u015f\u0131la\u015f\u0131lan sebebi, web sitelerinin \u00f6n\u00fcnde bir kalkan olarak kullan\u0131lan CDN (\u00d6zellikle Cloudflare) servislerindeki yanl\u0131\u015f yap\u0131land\u0131rmad\u0131r.<\/p>\n\n\n\n<p>E-ticaret sitesi sahibi <strong>Doruk<\/strong>, siber sald\u0131r\u0131lardan korunmak i\u00e7in sitesini Cloudflare&#8217;e ba\u011flar. Ancak i\u015flemden hemen sonra sitesi <code>ERR_SSL_VERSION_OR_CIPHER_MISMATCH<\/code> hatas\u0131 vermeye ba\u015flar. Doruk&#8217;un yapt\u0131\u011f\u0131 temel hatalar ve \u00e7\u00f6z\u00fcmleri \u015funlard\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sertifikan\u0131n Yay\u0131lmas\u0131n\u0131 Beklememek:<\/strong> Sitenizi Cloudflare&#8217;e ilk ekledi\u011finizde, Cloudflare&#8217;in sizin ad\u0131n\u0131za k\u00fcresel &#8220;Edge&#8221; (U\u00e7) sertifikalar\u0131n\u0131 olu\u015fturmas\u0131 ve d\u00fcnyadaki t\u00fcm sunuculara da\u011f\u0131tmas\u0131 15 dakika ile 24 saat aras\u0131nda s\u00fcrebilir. Bu s\u00fcre\u00e7te SSL do\u011frulanamad\u0131\u011f\u0131 i\u00e7in bu hata \u00e7\u0131kar.\n<ul class=\"wp-block-list\">\n<li><em>\u00c7\u00f6z\u00fcm:<\/em> Cloudflare paneline girin, <strong>SSL\/TLS > Edge Certificates<\/strong> sekmesine bak\u0131n. Sertifika durumunda &#8220;Pending Validation&#8221; (Do\u011frulama Bekliyor) yaz\u0131yorsa, i\u015flem tamamlanana kadar beklemeniz gerekir.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u015eifreleme Modu Uyu\u015fmazl\u0131\u011f\u0131 (Flexible vs. Full\/Strict):<\/strong> Cloudflare \u00fczerinde SSL modunuz &#8220;Flexible&#8221; (Esnek) olarak se\u00e7iliyse, Cloudflare ziyaret\u00e7iyle \u015fifreli konu\u015fur ancak sizin sunucunuza (Origin) \u015fifresiz (HTTP) ba\u011flanmaya \u00e7al\u0131\u015f\u0131r. E\u011fer sunucunuz HTTP ba\u011flant\u0131lar\u0131 reddediyorsa bu hata ortaya \u00e7\u0131kar.\n<ul class=\"wp-block-list\">\n<li><em>\u00c7\u00f6z\u00fcm:<\/em> Cloudflare <strong>SSL\/TLS > Overview<\/strong> sekmesine gidin. SSL \u015fifreleme modunu <strong>Full<\/strong> veya <strong>Full (Strict)<\/strong> olarak de\u011fi\u015ftirin.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Adim_3_Eski_TLS_10_ve_11_Protokollerini_Kapatin_TLS_12_ve_13u_Aktif_Edin\"><\/span>Ad\u0131m 3: Eski TLS (1.0 ve 1.1) Protokollerini Kapat\u0131n, TLS 1.2 ve 1.3&#8217;\u00fc Aktif Edin<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>2020 y\u0131l\u0131ndan itibaren Google, Apple, Microsoft ve Mozilla ortak bir kararla TLS 1.0 ve TLS 1.1 protokollerinin deste\u011fini taray\u0131c\u0131lar\u0131ndan tamamen kald\u0131rd\u0131lar. E\u011fer sunucunuz (Apache, Nginx veya IIS) sadece bu eski s\u00fcr\u00fcmleri destekleyecek \u015fekilde ayarland\u0131ysa, hi\u00e7bir modern ziyaret\u00e7i sitenize giremez.<\/p>\n\n\n\n<p>Sistem y\u00f6neticisi <strong>\u015eule<\/strong>, sanal sunucusundaki yap\u0131land\u0131rma dosyalar\u0131n\u0131 a\u00e7arak bu sorunu giderir:<\/p>\n\n\n\n<p><strong>Apache Sunucularda \u00c7\u00f6z\u00fcm:<\/strong> \u015eule, sunucudaki <code>ssl.conf<\/code> veya ilgili sanal konak (virtual host) dosyas\u0131n\u0131 a\u00e7ar ve &#8220;SSLProtocol&#8221; sat\u0131r\u0131n\u0131 bulur. Bu sat\u0131r\u0131 \u015fu \u015fekilde g\u00fcncelleyerek eski s\u00fcr\u00fcmleri yasaklar:<\/p>\n\n\n\n<p>Apache<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SSLProtocol all -SSLv2 -SSLv3 -TLSv1 -TLSv1.1\n<\/code><\/pre>\n\n\n\n<p>Bu kod, t\u00fcm modern protokolleri a\u00e7arken eski nesil zafiyetli protokolleri eksi (-) i\u015faretiyle kapat\u0131r. Dosyay\u0131 kaydettikten sonra Apache servisini yeniden ba\u015flat\u0131r.<\/p>\n\n\n\n<p><strong>Nginx Sunucularda \u00c7\u00f6z\u00fcm:<\/strong> Nginx sunucusunda <code>nginx.conf<\/code> veya site yap\u0131land\u0131rma dosyas\u0131 a\u00e7\u0131larak &#8220;ssl_protocols&#8221; sat\u0131r\u0131 \u015fu \u015fekilde de\u011fi\u015ftirilir:<\/p>\n\n\n\n<p>Nginx<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssl_protocols TLSv1.2 TLSv1.3;\n<\/code><\/pre>\n\n\n\n<p>Bu sayede sunucu, taray\u0131c\u0131larla ileti\u015fim kurarken sadece en g\u00fcvenli ve modern dilleri konu\u015fmaya zorlan\u0131r.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Adim_4_Guclu_Sifreleme_Setlerini_Cipher_Suites_Tanimlayin\"><\/span>Ad\u0131m 4: G\u00fc\u00e7l\u00fc \u015eifreleme Setlerini (Cipher Suites) Tan\u0131mlay\u0131n<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Hata kodunun sonundaki &#8220;CIPHER_MISMATCH&#8221; k\u0131sm\u0131, matematiksel \u015fifreleme algoritmalar\u0131n\u0131n uyu\u015fmad\u0131\u011f\u0131n\u0131 g\u00f6sterir. Ge\u00e7mi\u015fte \u00e7ok pop\u00fcler olan <strong>RC4<\/strong> veya <strong>3DES<\/strong> gibi \u015fifreleme algoritmalar\u0131 g\u00fcn\u00fcm\u00fczde k\u0131r\u0131lm\u0131\u015f (deprecated) kabul edilmektedir. Sunucunuz bunlar\u0131 kullanmakta \u0131srar ederse taray\u0131c\u0131lar ba\u011flant\u0131y\u0131 kopar\u0131r.<\/p>\n\n\n\n<p>Bunu \u00e7\u00f6zmek i\u00e7in sunucunuzda sadece modern, g\u00fc\u00e7l\u00fc ve &#8220;Forward Secrecy&#8221; (\u0130leriye D\u00f6n\u00fck Gizlilik) destekleyen \u015fifreleme setlerini kullanmal\u0131s\u0131n\u0131z. Modern bir Nginx sunucusu i\u00e7in ideal Cipher Suite ayar\u0131 \u015fu \u015fekilde olmal\u0131d\u0131r:<\/p>\n\n\n\n<p>Nginx<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';\nssl_prefer_server_ciphers on;\n<\/code><\/pre>\n\n\n\n<p>Bu ayarlar uyguland\u0131\u011f\u0131nda, sunucu ile taray\u0131c\u0131 aras\u0131ndaki matematiksel \u015fifreleme dili modern bir standarda oturtulmu\u015f olur.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Gelecekte_Bu_Hatayi_Yasamamasi_Icin_Altin_Kurallar\"><\/span>Gelecekte Bu Hatay\u0131 Ya\u015famamas\u0131 \u0130\u00e7in Alt\u0131n Kurallar<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Siber g\u00fcvenlik s\u00fcrekli evrim ge\u00e7iren bir aland\u0131r. Bug\u00fcn &#8220;son derece g\u00fcvenli&#8221; kabul edilen bir teknoloji, yar\u0131n yeni bir a\u00e7\u0131k bulundu\u011funda terk edilebilir. Web sitenizin gelecekte yeniden bu tarz SSL krizleri ya\u015famamas\u0131 i\u00e7in alman\u0131z gereken \u00f6nlemler \u015funlard\u0131r:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Otomatik SSL Yenileme Kurgusu:<\/strong> Let&#8217;s Encrypt gibi \u00fccretsiz sertifikalar her 90 g\u00fcnde bir yenilenmelidir. Sunucunuzda &#8220;Certbot&#8221; gibi ara\u00e7larla Cron (Zamanlanm\u0131\u015f g\u00f6rev) tan\u0131mlayarak sertifikan\u0131z\u0131n s\u00fcresinin dolmas\u0131n\u0131 ve ge\u00e7ersiz hale gelmesini engelleyin.<\/li>\n\n\n\n<li><strong>Sunucu \u0130\u015fletim Sistemini G\u00fcncel Tutun:<\/strong> \u00c7ok eski bir i\u015fletim sistemi (\u00d6rne\u011fin CentOS 6 veya eski bir Ubuntu s\u00fcr\u00fcm\u00fc) kullan\u0131yorsan\u0131z, i\u00e7erisindeki &#8220;OpenSSL&#8221; k\u00fct\u00fcphaneleri eski kald\u0131\u011f\u0131 i\u00e7in yeni teknolojileri (TLS 1.3 gibi) isteseniz de destekleyemezsiniz. \u0130\u015fletim sistemi \u00e7ekirde\u011finizi d\u00fczenli olarak y\u00fckseltin (Upgrade).<\/li>\n\n\n\n<li><strong>D\u00fczenli Denetim (Audit):<\/strong> SSLLabs veya benzeri platformlardan her alt\u0131 ayda bir sitenizi teste sokarak g\u00fcvenlik notunuzu kontrol edin. Sisteminizin &#8220;A&#8221; veya &#8220;A+&#8221; skorunu korudu\u011fundan emin olun.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sonuc\"><\/span>Sonu\u00e7<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><code>ERR_SSL_VERSION_OR_CIPHER_MISMATCH<\/code> hatas\u0131, ilk bak\u0131\u015fta karma\u015f\u0131k bir yaz\u0131l\u0131m \u00e7\u00f6kmesi gibi g\u00f6r\u00fcnse de; \u00f6z\u00fcnde taray\u0131c\u0131 ile sunucunun &#8220;g\u00fcvenlik standartlar\u0131&#8221; konusunda uzla\u015famamas\u0131d\u0131r. 2026 y\u0131l\u0131n\u0131n bilin\u00e7li internet kullan\u0131c\u0131lar\u0131, taray\u0131c\u0131lar\u0131nda kilit i\u015faretini g\u00f6remedikleri hi\u00e7bir web sitesine kredi kart\u0131 bilgilerini girmemekte, hatta siteyi an\u0131nda terk etmektedir.<\/p>\n\n\n\n<p>E\u011fer s\u0131radan bir internet kullan\u0131c\u0131s\u0131ysan\u0131z, taray\u0131c\u0131 \u00f6nbelle\u011finizi temizlemek ve antivir\u00fcs ayarlar\u0131n\u0131z\u0131 kontrol etmek sorununuzu b\u00fcy\u00fck ihtimalle \u00e7\u00f6zecektir. Ancak bir web sitesi veya sunucu y\u00f6neticisiyseniz, altyap\u0131n\u0131zdaki tozlu ve eski g\u00fcvenlik protokollerini derhal terk etmeli, Cloudflare entegrasyonlar\u0131n\u0131z\u0131 do\u011fru yap\u0131land\u0131rmal\u0131 ve TLS 1.3 \/ modern \u015fifreleme setlerini aktif ederek dijital m\u00fclk\u00fcn\u00fcz\u00fc en g\u00fcncel koruma standartlar\u0131yla donatmal\u0131s\u0131n\u0131z. Unutmay\u0131n, dijital d\u00fcnyada g\u00fcven, kusursuz \u00e7al\u0131\u015fan bir SSL sertifikas\u0131yla ba\u015flar.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0130nternette gezinirken veya kendi web sitenize giri\u015f yapmaya \u00e7al\u0131\u015f\u0131rken kar\u015f\u0131n\u0131za<a href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/\">&#8230;<\/a><\/p>\n","protected":false},"author":6,"featured_media":23778,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-23776","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-genel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cenuta.com\/blog\/err_ssl_version_or_cipher_mismatch-hatasi-nedir-kesin-cozum-yontemleri-2026\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ERR_SSL_VERSION_OR_CIPHER_MISMATCH Hatas\u0131 Nedir? 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