How to Fix ERR SSL VERSION OR CIPHER MISMATCH?

An ERR SSL VERSION OR CIPHER MISMATCH error can prevent you from accessing the website you want. This error indicates that the requested site has outdated security standards. The best way is for the administrator of such site to make sure that TLS 1.2 (or later versions) and TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 are used for creating temporary server authentication keys.

ERR SSL VERSION OR CIPHER MISMATCH

If there is no connection to the administrator, try the following methods:

Note: The examples below were shown on Google Chrome, but you can use them for other browsers, such as Opera or Firefox.

• Delete Google browser cache and cookies. Press Ctrl, Shift and Del together. In the window, specify that you want to clear “all time”, check the boxes “clear cache” and “clear cookies”, confirm the removal by clicking on “Clear history”.
• Change the address of the site. Delete the beginning (https://) in the address bar. In this case, the browser may load a different version of the website and won’t generate an error.
• Make sure there are no unknown add-ons in the browser. Load the page in incognito mode. If it works, one of the Chrome extensions is to blame. Turn them all off and then turn them on one by one and refresh the problem page. This is done by clicking on the three vertical dots in the top right corner of the browser, after “Advanced Tools” => “Extensions.”
• Change your Chrome settings. In the address bar, type chrome://flags/ and press Enter. Look for the line TLS 1.3 and Experimental QUIC protocol. For the first line, make sure it’s enabled, and for the other line, make sure it’s disabled. Reboot your browser and try to open the failed page.
• Clear the SSL cache. Press Win+R and execute inetcpl.cpl. A window will open in which go to “Contents” and click on “Clear SSL”.
• Check your antivirus or firewall. Disable such programs completely. If in this case the site opens without the error “ERR_SSL_VERSION_OR_CIPHER_MISMATCH”, then it is all about incorrect settings of security apps.

Authordman