Better Stack Team
Updated on March 7, 2023


Browser displaying the following error: ERR_SSL_VERSION_OR_CIPHER_MISMATCH which prevents you from accessing the site

Couse of the problem

When you are accessing the HTTPS secured website a series of steps is taken in the background to ensure that the connection is safe and trusted. Some of these steps consist of checking certificates. If the browser does not believe that the connection would be secure it displays this error.


Check your SSL certificate

Perform an SSL Server Test on the SSLlabs. If there is a problem with SSL on your server it will tell you the exact cause.

Check if your SSL certificate name is mismatching

These are possible reasons for mismatch:

  • Your website does not use SSL but shares IP with a site that does.
  • The website doesn't exist anymore, yet the domain is still pointing to the old IP where a different website is hosted
  • The website uses CDN that doesn't support SSL
  • The domain name alias is for a website whose name is different, but the alias was not included in the certificate

Update your browser

This error also occurs in old and outdated browsers. Try updating your browser to the newest version and try loading the website again.

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