Fixing the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error in the browser

The appearance of the message ERR_SSL_VERSION_OR_CIPHER_MISMATCH will prevent you from visiting the site. This indicates that the user security standards for the requested resource are outdated. It is best for the site administrator to ensure that TLS 1.2 (or later) and TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 are used to generate temporary server authentication keys.

How to fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH error

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

1. Delete the cache and cookies of Chrome. Press together the Ctrl, Shift and Del buttons. In the window, indicate that clearing is needed “for all time”, tick the lines “clear cache” and “clear cookies”, confirm the deletion by clicking on “Clear history”.
2. Change the site address. Remove the beginning – https: // from the address bar. In this case, the browser can load a different version of the resource and will not give an error.
3. Make sure there are no unknown add-ons in your browser. Load the page in incognito mode. If everything worked out, then one of the Chrome extensions is to blame. Disable them all, and then enable one at a time and update the problem page. This is done by clicking on the three vertical dots in the upper right corner of the browser, after “More tools” => “Extensions”.
4. Change your Chrome settings. In the address bar, enter hrome: // flags and press Enter. Find the line TLS 1.3 and Experimental QUIC protocol. For the first line, make sure it is enabled, and for the other, it is disabled. Restart your browser, try to open the crashing page.
5. Throw off SSL cache. Hold the Win + R combination. A window will open in which go to “Contents” and click on “Clear SSL”.
6. Look for an antivirus or firewall problem. Disable such programs completely. If in this case the site opens without the error “ERR_SSL_VERSION_OR_CIPHER_MISMATCH”, then the whole point is in the incorrect settings of the protective applications.