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Any idea why?
Opera is crap and you are a masochist to continue using it?
Yup, seems to be the case: http://forums.opera.com/discussion/1773932/broken-websites-twitter-tumblr/p1
Restarting your browser may resolve it, disabling security features may resolve it, changing your browser will resolve it.
For fun I checked the certificate, re-read all the details, verified that it's valid and well-cached, checked the revocation status, confirmed that it has a non-SNI fallback, and re-verified the availability of the OCSP stapling and that the server in question is up. Everything is good... it's Opera.
I'm getting:
Secure connection: fatal error (1066) https://www.lfgss.com/updates Unable to verify the Web site's identity (OCSP error). The response from the online certificate validation (OCSP) server was too old.
on Opera/9.80 (Windows NT 6.2; Win64; x64) Presto/2.12.388 Version/12.17 only, everything is fine on other browsers. Any idea why?