@bigalsworth said in ERR_EMPTY_RESPONSE on auth.opera.com:
@davis1232 I think donq is right about the cert thing. When I was showing a guy at work that fiddler fixed it he thought cert too, but I'm not a network guy so not sure how to track that down
Sorry, I can't help here I'm in no way a security/network expert.
I could suggest to compare all this protocol handshake in fiddler with and without decyption (alhtough without decryption you likely can't see much), maybe you can see someting under Opera dev tools network tab (or not), maybe you could search for security related events in Windows event viewer (you may see some SSL errors there - but not always), you could analyze cert contents (Opera auth server vs Fiddler "fake" one); maybe you could configure some aspects of Fiddler SSL/TLS connection etc - a lot of guesswork.
Most likely this is some problem with chipers (client and server can't properly understand each other) and Opera auth server improper handling of some SSL/TLS protocol properties - but even if I had same problem here, I'm not sure that I could find real cause of troubles.
Have you filed Opera bug report?