SSL connection failed? MITM?

[VirtualLarry]

Secure Connection Failed

An error occurred during a connection to en.wikipedia.org. 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

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Browser is Waterfox 35.0, recently updated (although the pages loaded fine after the update). I just did Windows 7 updates just now, and immediately afterwards, that's when WikiPedia failed to load.

http://ubuntuforums.org/showthread.php?t=2261836

 

[seepy83]

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)

If you run en.wikipedia.org through Qualys's scanner at ssllabs.com/ssltest, you will see that the server only supports TLS 1.0, 1.1, and 1.2. I'm guessing your browser is trying to use either SSL 3 or SSL 2 (both of which are no longer secure) and the server is rejecting it.

I'm not familiar with Waterfox, but look for your TLS/SSL settings and make sure the TLS protocols are enabled and SSL is disabled.


Edit: actually, after reading the IETF doc on TLS Fallback SCSV (https://datatracker.ietf.org/doc/draft-ietf-tls-downgrade-scsv/), it sounds like your browser attempted a supported version of TLS first, the handshake failed, and then the downgrade was rejected. Again, I'm not familiar with Waterfox...but I would try another browser as a first test, and then go from there.