Ran into a bit of a sticky wicket today. And for reasons that should be obvious it was a bit difficult to google for a solution, so I backed out the upgrade. So I'm hoping someone here has seen and fixed this already. System: CentOS 7, fully updated. After the nss updates in the past day or so, visiting https://www.google.com with Firefox results in the following error screen: Secure Connection Failed An error occurred during a connection to www.google.com. The server rejected the handshake because the client downgraded to a lower TLS version than the server supports. (Error code: ssl_error_inappropriate_fallback_alert) The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the website owners to inform them of this problem. Alternatively, use the command found in the help menu to report this broken site. Ok, so how do I fix this (other than 'yum downgrade nss firefox nss-sysinit nss-devel nss-tools' which does 'fix' the issue)?