Battle.net error code BLZBNTBNA00000640 (1201) Mon, Aug 4. 2014
Whoops! Hmm, something went wrong with a security certificate.
Recently Conor has been playing WoW and we came across an issue where the battle.net client displays this error rather than the latest Blizzard news.
I think it's safe to assume that Blizzard used an embedded web browser control for this section of the application, and most if not all of the recommended steps they provide (restarting battle.net, reinstalling, etc.) aren't going to fix the underlying problem, which has to do with SSL certificate validation going on in the requested page. What did actually fix this under OSX, was deleting the certificate in question from the OSX keychain. Read the rest of this for the how to.
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