SSLERRORUNSUPPORTEDVERSION-12279 'Peer using unsupported version of security protocol.' On a client socket, this means the remote server has attempted to negotiate the use of a version of SSL that is not supported by the NSS library, probably an invalid version number. Advanced info: sslerrorunsupportedversion tls. Improve this question. Follow edited Dec 21 '15 at 11:37. Asked Dec 21 '15 at 10:58. 863 1 1 gold badge 7 7 silver badges 8 8 bronze badges. I am well aware that you have already accepted an answer but I just wanted to point out how you can get an older version.

  1. Ssl_error_unsupported_version Chrome
  2. Advanced Info: Ssl_error_unsupported_version
  3. Firefox Ssl Error Unsupported Version
  4. Error Code: Ssl_error_unsupported_version
  5. Ssl Protocol Version

Starting about a week ago, several sites/pages that I've previously visited successfully will no longer load. Most notably, I can no longer get Amazon's 'My Cart' page to load. Instead, I get the following message:


Ssl_error_unsupported_version Chrome


Advanced Info: Ssl_error_unsupported_version

Ssl_error_unsupported_version printer

Well, I'm not likely to get much attention from Amazon, and the smaller sites are as confused about this as I am.

Firefox Ssl Error Unsupported Version

I've already tried the 'no proxy' setting in FF (no joy) and renaming cert8.db and deleting cert_override.txt (also no joy).

Error Code: Ssl_error_unsupported_version


Ssl Protocol Version

My next test is to disable all of the extensions that I've installed in the past month (but I have to restart, so this post comes first--I'll report back in a reply).