SSL / TLSChrome · Edge · Firefox
ERR_SSL_VERSION_OR_CIPHER_MISMATCHSSL Version or Cipher Mismatch
Your browser and the server couldn't agree on a mutually supported SSL/TLS version or cipher suite. Often seen on very old or very locked-down servers.
Why this happens
- Server only supports TLS 1.0/1.1, which Chrome disabled in 2022
- Server's cipher suite list doesn't overlap with the browser's
- Browser TLS settings have been restricted by policy
- Server using RC4 or other deprecated ciphers
How to fix it
- 1
The site owner needs to enable TLS 1.2 or TLS 1.3 on their server
- 2
If on a managed device, check if IT policy restricts allowed ciphers
- 3
Try the site in Firefox which may have different TLS defaults
- 4
If you manage the site, run an SSL test to identify the issue
Diagnose it faster
Use our free tools to check whether the issue is on your end or the server's: