Safari "can't establish a secure connection to the server "
Per the title, Safari has started saying that it cannot establish a secure connection to the server. This occurs when I try to log in to any website.
I have reset Safari, I have turned my router off and on (I am using a WiFi connection).
I upgraded (today) to the newest software, Mountain Lion.
There is another Mac in the house (not on Mountain Lion) that works fine.
I downloaded FireFox and everything works fine.
I am using a Macbook Pro.
Fix, anyone?
MacBook Pro, OS X Mountain Lion