Yes, 12.17.
Looking in Opera Preferences -> Advanced -> Security
Manage Certificates...

I have a lot of *.facebook.com rejected certificates: around 60 or 70!

Is it possible that every time a somehow different certificate is issued? (even when being on the same page).

Thx but, once again, my original question remains: why Opera does not remember the choice of rejecting the certificates?
I don't want to view Facebook pages, I'd want to get rid of these annoying pop-ups.

The popup reports the following:

Holder: *.facebook.com, Facebook, Inc.
Issuer: 10.249.6.201, Blue Coat SG9000 Series
Expires: 13/04/2015 13.00.00 GMT

Encryption protocol
256 bit AES (RSA/SHA).

I believe 10.249.6.201 to be the proxy server/firewall of my company.
Blue Coat is indeed a web proxy manufacturer.
Additional info: Facebook is blocked.

It seems that the proxy makes Opera believe the certificate to be issued by itself, hence Opera of course does not recognize it.

Can I store this proxy's certificate in Opera?

That's true but thing is these popup warnings are a bit more annoying then the "like" buttons on the web pages... :=)

I really don't understand why the remember flag is not working.
I consider it a bug.

Actually the real question should be "why the webpage is trying to connect to facebook?".
Even if I go to https://forums.opera.com/category/11/opera-for-windows I get the same warning.
This means that in way or another opera forum page is linked with facebook.
Isn't it possible to block these connections?

Ok, but why the "Remember my choice for this certificate" does not work?

Hello.
On almost every site I browse, I got a warning pop-up telling me that there are some certificate errors.
Typically it seems to be coming from facebook: "The certificate for "*.facebook.com" is signed by the unknown Certificate Authority..." etc

I usually click on "Remember my choice for this certificate" and then "Reject".

The problem is that the choice is not remembered: every time I have to reject it again.

Is it possible to automatically reject all the *.facebook.com certificates?

Thx a lot.