{"id":2455,"date":"2021-07-17T05:46:00","date_gmt":"2021-07-17T05:46:00","guid":{"rendered":"https:\/\/zynoo.com\/blog\/err-ssl-version-or-cipher-mismatch\/"},"modified":"2026-10-22T12:37:23","modified_gmt":"2026-10-22T12:37:23","slug":"err-ssl-version-or-cipher-mismatch","status":"publish","type":"post","link":"https:\/\/zynoo.com\/blog\/fr\/err-ssl-version-or-cipher-mismatch\/","title":{"rendered":"ERR_SSL_VERSION_OR_CIPHER_MISMATCH : comment y rem\u00e9dier"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">L&rsquo;erreur <strong>ERR_SSL_VERSION_OR_CIPHER_MISMATCH<\/strong> appara\u00eet lorsque Google Chrome ne parvient pas \u00e0 \u00e9tablir une connexion HTTPS s\u00e9curis\u00e9e avec un site web. Elle indique g\u00e9n\u00e9ralement que le navigateur et le serveur ne parviennent pas \u00e0 s&rsquo;accorder sur des param\u00e8tres de chiffrement compatibles, bien que certains probl\u00e8mes li\u00e9s aux certificats SSL et \u00e0 la configuration du CDN puissent \u00e9galement la d\u00e9clencher.<\/p>\n\n<p class=\"wp-block-paragraph\">Si vous consultez un site web, le probl\u00e8me peut \u00eatre ind\u00e9pendant de votre volont\u00e9. Si vous g\u00e9rez ce site, vous devrez v\u00e9rifier sa configuration SSL\/TLS.<\/p>\n\n<p class=\"wp-block-paragraph\">Ce guide explique les causes de cette erreur et comment y rem\u00e9dier en toute s\u00e9curit\u00e9.<\/p>\n\n<h2 id=\"h-what-does-err-ssl-version-or-cipher-mismatch-mean\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Que_signifie_lerreur_ERR_SSL_VERSION_OR_CIPHER_MISMATCH\"><\/span>Que signifie l\u2019erreur ERR_SSL_VERSION_OR_CIPHER_MISMATCH ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">Lorsque vous ouvrez un site web HTTPS, votre navigateur et le serveur effectuent une <strong>poign\u00e9e de main TLS<\/strong>. Au cours de cet \u00e9change, ils n\u00e9gocient un protocole de chiffrement et une suite de chiffrement avant de transmettre les donn\u00e9es du site web en toute s\u00e9curit\u00e9.<\/p>\n\n<p class=\"wp-block-paragraph\">S\u2019ils ne parviennent pas \u00e0 \u00e9tablir une connexion compatible, Chrome peut afficher le message suivant :<\/p>\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><code>ERR_SSL_VERSION_OR_CIPHER_MISMATCH<\/code><\/p>\n<\/blockquote>\n\n<p class=\"wp-block-paragraph\">Firefox peut afficher un message diff\u00e9rent, tel que \u00ab <code>SSL_ERROR_NO_CYPHER_OVERLAP<\/code> \u00bb.<\/p>\n\n<p class=\"wp-block-paragraph\">Les sites web modernes devraient prendre en charge le protocole TLS 1.2 et, de pr\u00e9f\u00e9rence, le protocole TLS 1.3. Les protocoles plus anciens, notamment TLS 1.0 et TLS 1.1, ne sont plus pris en charge par les navigateurs modernes.<\/p>\n\n<p class=\"wp-block-paragraph\">Cette erreur ne signifie pas n\u00e9cessairement qu\u2019un site web a \u00e9t\u00e9 pirat\u00e9. Elle indique simplement que le navigateur n\u2019a pas pu \u00e9tablir la connexion s\u00e9curis\u00e9e attendue.<\/p>\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/zynoo.com\/blog\/wp-content\/uploads\/2021\/07\/SSL-Cipher-Mismatch-Warning-1024x576.png\" alt=\"Illustration de l'erreur de navigateur &#xAB; ERR_SSL_VERSION_OR_CIPHER_MISMATCH &#xBB; montrant la configuration SSL\/TLS, l'&#xE9;chec de la connexion HTTPS et la version TLS prise en charge\" class=\"wp-image-2453\" srcset=\"https:\/\/zynoo.com\/blog\/wp-content\/uploads\/2021\/07\/SSL-Cipher-Mismatch-Warning-1024x576.png 1024w, https:\/\/zynoo.com\/blog\/wp-content\/uploads\/2021\/07\/SSL-Cipher-Mismatch-Warning-300x169.png 300w, https:\/\/zynoo.com\/blog\/wp-content\/uploads\/2021\/07\/SSL-Cipher-Mismatch-Warning-768x432.png 768w, https:\/\/zynoo.com\/blog\/wp-content\/uploads\/2021\/07\/SSL-Cipher-Mismatch-Warning-1536x864.png 1536w, https:\/\/zynoo.com\/blog\/wp-content\/uploads\/2021\/07\/SSL-Cipher-Mismatch-Warning.png 1672w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h2 id=\"h-what-causes-this-ssl-error\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quelles_sont_les_causes_de_cette_erreur_SSL\"><\/span>Quelles sont les causes de cette erreur SSL ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">Plusieurs probl\u00e8mes peuvent emp\u00eacher une connexion HTTPS de fonctionner.<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Protocoles TLS obsol\u00e8tes :<\/strong> le serveur ne prend en charge que des protocoles de chiffrement que les navigateurs modernes rejettent.<\/li>\n\n\n\n<li><strong>Suites de chiffrement incompatibles :<\/strong> le navigateur et le serveur ne disposent d\u2019aucun algorithme de chiffrement pris en charge par les deux parties.<\/li>\n\n\n\n<li><strong>Probl\u00e8mes de configuration du certificat :<\/strong> le serveur ou le CDN ne pr\u00e9sente pas de certificat appropri\u00e9 pour le nom d&rsquo;h\u00f4te demand\u00e9.<\/li>\n\n\n\n<li><strong>Configuration Cloudflare :<\/strong> un certificat est peut-\u00eatre encore en cours d\u2019activation, ou un sous-domaine n\u2019est peut-\u00eatre pas couvert par le certificat actuel.<\/li>\n\n\n\n<li><strong>Logiciels clients obsol\u00e8tes :<\/strong> un navigateur, un syst\u00e8me d\u2019exploitation ou un produit de s\u00e9curit\u00e9 r\u00e9seau plus ancien peut ne pas prendre en charge les param\u00e8tres de chiffrement du serveur.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">La solution appropri\u00e9e d\u00e9pend de l&rsquo;origine du probl\u00e8me.<\/p>\n\n<h2 id=\"h-how-to-fix-err-ssl-version-or-cipher-mismatch\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Comment_resoudre_lerreur_ERR_SSL_VERSION_OR_CIPHER_MISMATCH\"><\/span>Comment r\u00e9soudre l&rsquo;erreur ERR_SSL_VERSION_OR_CIPHER_MISMATCH<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<h3 id=\"h-1-check-whether-the-problem-affects-one-website\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Verifiez_si_le_probleme_concerne_un_seul_site_web\"><\/span>1. V\u00e9rifiez si le probl\u00e8me concerne un seul site web<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Commencez par d\u00e9terminer si l&rsquo;erreur appara\u00eet sur un seul site web ou sur plusieurs.<\/p>\n\n<p class=\"wp-block-paragraph\">Si un seul site web ne fonctionne pas, le probl\u00e8me est probablement li\u00e9 \u00e0 son serveur, \u00e0 son certificat ou \u00e0 la configuration de son CDN.<\/p>\n\n<p class=\"wp-block-paragraph\">Si plusieurs sites web sans rapport entre eux ne fonctionnent pas, v\u00e9rifiez votre navigateur, votre syst\u00e8me d&rsquo;exploitation, votre connexion r\u00e9seau et vos logiciels de s\u00e9curit\u00e9.<\/p>\n\n<p class=\"wp-block-paragraph\">Essayez d\u2019ouvrir le site web concern\u00e9 dans un autre navigateur \u00e0 jour ou sur un autre appareil. Ce test simple peut vous aider \u00e0 cerner la cause du probl\u00e8me.<\/p>\n\n<h3 id=\"h-2-check-the-website-s-ssl-certificate\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Verifiez_le_certificat_SSL_du_site_web\"><\/span>2. V\u00e9rifiez le certificat SSL du site web<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Si vous g\u00e9rez le site web, commencez par v\u00e9rifier sa configuration SSL\/TLS publique.<\/p>\n\n<p class=\"wp-block-paragraph\">Utilisez l\u2019outil gratuit <a href=\"https:\/\/www.ssllabs.com\/ssltest\/\">SSL Labs Server Test<\/a> pour analyser le domaine.<\/p>\n\n<p class=\"wp-block-paragraph\">Pr\u00eatez attention aux \u00e9l\u00e9ments suivants :<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Expiration et validit\u00e9 du certificat.<\/li>\n\n\n\n<li>Couverture des noms d\u2019h\u00f4te, y compris <code>www<\/code> et ses sous-domaines.<\/li>\n\n\n\n<li>Configuration de la cha\u00eene de certificats.<\/li>\n\n\n\n<li>Versions TLS et suites de chiffrement prises en charge.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">SSL Labs identifie les probl\u00e8mes de configuration, mais ne met pas \u00e0 jour les certificats ni ne modifie les param\u00e8tres du serveur.<\/p>\n\n<p class=\"wp-block-paragraph\">Si votre certificat a expir\u00e9, renouvelez-le et v\u00e9rifiez que le serveur web ou le proxy inverse le pr\u00e9sente correctement.<\/p>\n\n<p class=\"wp-block-paragraph\">Les probl\u00e8mes li\u00e9s aux certificats peuvent g\u00e9n\u00e9rer plusieurs types d&rsquo;erreurs de navigateur ; ne supposez donc pas que chaque avertissement concernant un certificat correspond \u00e0 une incompatibilit\u00e9 de chiffrement.<\/p>\n\n<h3 id=\"h-3-enable-modern-tls-versions\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Activez_les_versions_TLS_modernes\"><\/span>3. Activez les versions TLS modernes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Votre serveur web doit prendre en charge les protocoles de chiffrement modernes.<\/p>\n\n<p class=\"wp-block-paragraph\">Pour la plupart des sites web publics, <strong>TLS 1.2 et TLS 1.3<\/strong> constituent une base raisonnable en mati\u00e8re de compatibilit\u00e9 et de s\u00e9curit\u00e9.<\/p>\n\n<p class=\"wp-block-paragraph\">Si le serveur ne prend en charge que TLS 1.0 ou TLS 1.1, les navigateurs modernes peuvent refuser la connexion.<\/p>\n\n<p class=\"wp-block-paragraph\">Les administrateurs de sites Web doivent v\u00e9rifier les param\u00e8tres SSL\/TLS dans Apache, Nginx ou leur panneau de contr\u00f4le d\u2019h\u00e9bergement.<\/p>\n\n<p class=\"wp-block-paragraph\">Activez les suites de chiffrement modernes appropri\u00e9es et supprimez les protocoles obsol\u00e8tes. Si le logiciel serveur est trop ancien pour les prendre en charge, une mise \u00e0 jour peut s\u2019av\u00e9rer n\u00e9cessaire.<\/p>\n\n<p class=\"wp-block-paragraph\">\u00c9vitez d&rsquo;activer un cryptage obsol\u00e8te dans le seul but de permettre \u00e0 un ancien navigateur de se connecter. Cela affaiblit la s\u00e9curit\u00e9 des autres visiteurs.<\/p>\n\n<h3 id=\"h-4-check-cloudflare-ssl-settings\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Verifiez_les_parametres_SSL_de_Cloudflare\"><\/span>4. V\u00e9rifiez les param\u00e8tres SSL de Cloudflare<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Si votre site web utilise Cloudflare, l\u2019erreur peut provenir de son certificat de p\u00e9riph\u00e9rie plut\u00f4t que de votre serveur d\u2019origine.<\/p>\n\n<p class=\"wp-block-paragraph\">Cloudflare identifie plusieurs causes possibles, notamment :<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Un certificat dont l&rsquo;activation n&rsquo;est pas encore termin\u00e9e.<\/li>\n\n\n\n<li>Un certificat personnalis\u00e9 arriv\u00e9 \u00e0 expiration.<\/li>\n\n\n\n<li>Un nom d&rsquo;h\u00f4te qui n&rsquo;est pas couvert par le certificat actif.<\/li>\n\n\n\n<li>Des param\u00e8tres de proxy incorrects pour un enregistrement DNS.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Pour v\u00e9rifier cela, ouvrez votre tableau de bord Cloudflare et acc\u00e9dez \u00e0 <strong>SSL\/TLS \u2192 Certificats Edge<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">V\u00e9rifiez si le certificat concern\u00e9 est actif et s&rsquo;il couvre le domaine ou le sous-domaine concern\u00e9.<\/p>\n\n<p class=\"wp-block-paragraph\">Les certificats Universal SSL standard de Cloudflare couvrent g\u00e9n\u00e9ralement le domaine principal et les sous-domaines de premier niveau. Un nom d\u2019h\u00f4te plus sp\u00e9cifique, tel que <code>app.dev.example.com<\/code>, peut n\u00e9cessiter une couverture suppl\u00e9mentaire par le certificat.<\/p>\n\n<p class=\"wp-block-paragraph\">Pour un HTTPS de bout en bout, assurez-vous \u00e9galement que votre serveur d\u2019origine dispose d\u2019un certificat adapt\u00e9. Le mode <strong>\u00ab Full \u00bb (strict)<\/strong> de Cloudflare valide le certificat d\u2019origine et est pr\u00e9f\u00e9rable lorsqu\u2019il est correctement configur\u00e9.<\/p>\n\n<h3 id=\"h-5-test-the-server-s-tls-connection\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Testez_la_connexion_TLS_du_serveur\"><\/span>5. Testez la connexion TLS du serveur<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Si vous disposez d\u2019un acc\u00e8s au terminal, OpenSSL peut vous aider \u00e0 identifier les probl\u00e8mes de handshake.<\/p>\n\n<p class=\"wp-block-paragraph\">Ex\u00e9cutez la commande suivante, en rempla\u00e7ant le domaine d\u2019exemple par celui de votre site web :<\/p>\n\n<pre class=\"wp-block-code\"><code><code>openssl s_client -connect example.com:443 -servername example.com -tls1_2 -brief<\/code><\/code><\/pre>\n\n<p class=\"wp-block-paragraph\">Cela permet de v\u00e9rifier si le serveur est capable de n\u00e9gocier une connexion TLS 1.2 et affiche des informations sur le r\u00e9sultat.<\/p>\n\n<p class=\"wp-block-paragraph\">Vous pouvez \u00e9galement tester le protocole TLS 1.3 :<\/p>\n\n<pre class=\"wp-block-code\"><code><code>openssl s_client -connect example.com:443 -servername example.com -tls1_3 -brief<\/code><\/code><\/pre>\n\n<p class=\"wp-block-paragraph\">Un \u00e9tablissement de connexion \u00e9chou\u00e9 peut indiquer des versions de protocole non prises en charge, des param\u00e8tres incompatibles ou un autre probl\u00e8me de connexion.<\/p>\n\n<p class=\"wp-block-paragraph\">Si votre site web utilise plusieurs serveurs ou adresses IP, v\u00e9rifiez-les un par un. Un seul serveur mal configur\u00e9 peut entra\u00eener des dysfonctionnements intermittents du protocole HTTPS.<\/p>\n\n<h3 id=\"h-6-update-your-browser-and-operating-system\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_Mettez_a_jour_votre_navigateur_et_votre_systeme_dexploitation\"><\/span>6. Mettez \u00e0 jour votre navigateur et votre syst\u00e8me d&rsquo;exploitation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Si vous \u00eates un visiteur et que le site fonctionne sur d&rsquo;autres appareils, veuillez mettre \u00e0 jour votre navigateur et votre syst\u00e8me d&rsquo;exploitation.<\/p>\n\n<p class=\"wp-block-paragraph\">Un syst\u00e8me obsol\u00e8te peut ne pas prendre en charge les protocoles TLS actuels ou les autorit\u00e9s de certification de confiance.<\/p>\n\n<p class=\"wp-block-paragraph\">V\u00e9rifiez \u00e9galement la date et l&rsquo;heure de votre appareil, car des param\u00e8tres incorrects peuvent entra\u00eener des probl\u00e8mes de validation des certificats.<\/p>\n\n<p class=\"wp-block-paragraph\">La suppression des donn\u00e9es du navigateur peut aider \u00e0 r\u00e9soudre certains probl\u00e8mes locaux, mais elle ne permet g\u00e9n\u00e9ralement pas de corriger une configuration TLS incompatible sur le serveur du site web.<\/p>\n\n<h3 id=\"h-7-review-security-software-without-disabling-protection\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"7_Verifiez_vos_logiciels_de_securite_sans_desactiver_la_protection\"><\/span>7. V\u00e9rifiez vos logiciels de s\u00e9curit\u00e9 sans d\u00e9sactiver la protection<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Certains logiciels antivirus, proxys d\u2019entreprise et outils de s\u00e9curit\u00e9 r\u00e9seau inspectent le trafic HTTPS. Une inspection mal configur\u00e9e peut perturber les connexions s\u00e9curis\u00e9es.<\/p>\n\n<p class=\"wp-block-paragraph\">Si le probl\u00e8me survient uniquement sur un r\u00e9seau g\u00e9r\u00e9, contactez votre administrateur r\u00e9seau.<\/p>\n\n<p class=\"wp-block-paragraph\">\u00c9vitez de d\u00e9sactiver votre pare-feu ou votre protection antivirus simplement pour contourner l\u2019erreur. La meilleure solution consiste \u00e0 identifier et \u00e0 corriger la configuration \u00e0 l\u2019origine du conflit.<\/p>\n\n<h2 id=\"h-how-to-prevent-ssl-tls-errors\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Comment_prevenir_les_erreurs_SSLTLS\"><\/span>Comment pr\u00e9venir les erreurs SSL\/TLS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">Les propri\u00e9taires de sites Web peuvent r\u00e9duire les probl\u00e8mes HTTPS futurs gr\u00e2ce \u00e0 une maintenance r\u00e9guli\u00e8re :<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Renouvelez les certificats SSL avant leur expiration et surveillez les renouvellements automatiques.<\/li>\n\n\n\n<li>Maintenez \u00e0 jour les serveurs Web, les syst\u00e8mes d&rsquo;exploitation et les biblioth\u00e8ques de s\u00e9curit\u00e9.<\/li>\n\n\n\n<li>Assurez la compatibilit\u00e9 avec les protocoles TLS 1.2 et TLS 1.3.<\/li>\n\n\n\n<li>V\u00e9rifiez la couverture des certificats lors de l\u2019ajout de domaines ou de sous-domaines.<\/li>\n\n\n\n<li>Testez le protocole HTTPS apr\u00e8s avoir modifi\u00e9 les param\u00e8tres DNS, les param\u00e8tres CDN ou les configurations des serveurs.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Si vous rencontrez des boucles de redirection HTTPS apr\u00e8s l&rsquo;installation d&rsquo;un certificat, notre <a href=\"https:\/\/zynoo.com\/blog\/err-too-many-redirects\/\">guide de d\u00e9pannage \u00ab ERR_TOO_MANY_REDIRECTS<\/a> \u00bb traite ce probl\u00e8me sp\u00e9cifique.<\/p>\n\n<p class=\"wp-block-paragraph\">Pour les propri\u00e9taires de sites web qui pr\u00e9f\u00e8rent un h\u00e9bergement incluant la fourniture d\u2019un certificat SSL, <a href=\"https:\/\/zynoo.com\/shared-hosting.html\">l\u2019h\u00e9bergement mutualis\u00e9<\/a> de ZYNOO propose des certificats SSL ainsi que des services d\u2019h\u00e9bergement et d\u2019assistance.<\/p>\n\n<h2 id=\"h-frequently-asked-questions\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Foire_aux_questions\"><\/span>Foire aux questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1792672191732\"><strong class=\"schema-faq-question\">Puis-je contourner l&rsquo;erreur ERR_SSL_VERSION_OR_CIPHER_MISMATCH ?<\/strong> <p class=\"schema-faq-answer\">En g\u00e9n\u00e9ral, ce n&rsquo;est pas s\u00e9curis\u00e9. Le navigateur n&rsquo;a pas r\u00e9ussi \u00e0 \u00e9tablir une connexion chiffr\u00e9e compatible. Au lieu de contourner l&rsquo;avertissement, corrigez la configuration TLS ou celle du certificat.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792672207612\"><strong class=\"schema-faq-question\">Un certificat SSL p\u00e9rim\u00e9 peut-il \u00eatre \u00e0 l&rsquo;origine de cette erreur ?<\/strong> <p class=\"schema-faq-answer\">Les probl\u00e8mes li\u00e9s aux certificats peuvent entra\u00eener des d\u00e9faillances HTTPS, et un certificat de p\u00e9riph\u00e9rie Cloudflare p\u00e9rim\u00e9 ou manquant peut provoquer cette erreur. Toutefois, un certificat p\u00e9rim\u00e9 peut \u00e9galement g\u00e9n\u00e9rer un avertissement diff\u00e9rent dans le navigateur.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792672244374\"><strong class=\"schema-faq-question\">Le fait de vider le cache de Chrome permettra-t-il de r\u00e9soudre cette erreur ?<\/strong> <p class=\"schema-faq-answer\">En g\u00e9n\u00e9ral, non. Les probl\u00e8mes li\u00e9s au cache du navigateur ne constituent pas la cause principale des incompatibilit\u00e9s entre les versions TLS ou les algorithmes de chiffrement. Si le serveur ne prend en charge que des m\u00e9thodes de chiffrement obsol\u00e8tes, sa configuration doit \u00eatre corrig\u00e9e.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792672266622\"><strong class=\"schema-faq-question\">Dois-je activer TLS 1.0 ou TLS 1.1 ?<\/strong> <p class=\"schema-faq-answer\">Non. Ces protocoles sont obsol\u00e8tes. Veuillez mettre \u00e0 jour le serveur ou le client afin qu&rsquo;il prenne en charge TLS 1.2 ou TLS 1.3.<\/p> <\/div> <\/div>\n\n<h3 id=\"h-conclusion\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Le code d&rsquo;erreur ERR_SSL_VERSION_OR_CIPHER_MISMATCH indique qu&rsquo;une connexion HTTPS s\u00e9curis\u00e9e n&rsquo;a pas pu \u00eatre \u00e9tablie.<\/p>\n\n<p class=\"wp-block-paragraph\">Pour les visiteurs, commencez par essayer un autre navigateur ou un autre appareil et installez les mises \u00e0 jour logicielles. Pour les administrateurs de sites web, privil\u00e9giez la couverture des certificats, les versions TLS prises en charge, les suites de chiffrement et la configuration du CDN.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>L\u2019objectif n\u2019est pas de contourner les contr\u00f4les de s\u00e9curit\u00e9 du navigateur, mais de r\u00e9tablir une connexion HTTPS correctement configur\u00e9e.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;erreur ERR_SSL_VERSION_OR_CIPHER_MISMATCH appara\u00eet lorsque Google Chrome ne parvient pas \u00e0 \u00e9tablir une connexion HTTPS s\u00e9curis\u00e9e avec un site web. Elle indique g\u00e9n\u00e9ralement que le navigateur et le serveur ne parviennent pas \u00e0 s&rsquo;accorder sur des param\u00e8tres de chiffrement compatibles, bien que certains probl\u00e8mes li\u00e9s aux certificats SSL et \u00e0 la configuration du CDN puissent \u00e9galement [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2458,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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Au lieu de contourner l'avertissement, corrigez la configuration TLS ou celle du certificat.","inLanguage":"fr-FR"},"inLanguage":"fr-FR"},{"@type":"Question","@id":"https:\/\/zynoo.com\/blog\/fr\/err-ssl-version-or-cipher-mismatch\/#faq-question-1792672207612","position":2,"url":"https:\/\/zynoo.com\/blog\/fr\/err-ssl-version-or-cipher-mismatch\/#faq-question-1792672207612","name":"Un certificat SSL p\u00e9rim\u00e9 peut-il \u00eatre \u00e0 l'origine de cette erreur ?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Les probl\u00e8mes li\u00e9s aux certificats peuvent entra\u00eener des d\u00e9faillances HTTPS, et un certificat de p\u00e9riph\u00e9rie Cloudflare p\u00e9rim\u00e9 ou manquant peut provoquer cette erreur. Toutefois, un certificat p\u00e9rim\u00e9 peut \u00e9galement g\u00e9n\u00e9rer un avertissement diff\u00e9rent dans le navigateur.","inLanguage":"fr-FR"},"inLanguage":"fr-FR"},{"@type":"Question","@id":"https:\/\/zynoo.com\/blog\/fr\/err-ssl-version-or-cipher-mismatch\/#faq-question-1792672244374","position":3,"url":"https:\/\/zynoo.com\/blog\/fr\/err-ssl-version-or-cipher-mismatch\/#faq-question-1792672244374","name":"Le fait de vider le cache de Chrome permettra-t-il de r\u00e9soudre cette erreur ?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"En g\u00e9n\u00e9ral, non. Les probl\u00e8mes li\u00e9s au cache du navigateur ne constituent pas la cause principale des incompatibilit\u00e9s entre les versions TLS ou les algorithmes de chiffrement. Si le serveur ne prend en charge que des m\u00e9thodes de chiffrement obsol\u00e8tes, sa configuration doit \u00eatre corrig\u00e9e.","inLanguage":"fr-FR"},"inLanguage":"fr-FR"},{"@type":"Question","@id":"https:\/\/zynoo.com\/blog\/fr\/err-ssl-version-or-cipher-mismatch\/#faq-question-1792672266622","position":4,"url":"https:\/\/zynoo.com\/blog\/fr\/err-ssl-version-or-cipher-mismatch\/#faq-question-1792672266622","name":"Dois-je activer TLS 1.0 ou TLS 1.1 ?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Non. Ces protocoles sont obsol\u00e8tes. 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