I just got an error in Firefox 4 when trying to log into Gmail:
mail.google.com is using an invalid certificate
This certificate is only valid for *.mail.yahoo.com mail.yahoo.com
I use webmail notifier, so it checks both Y!mail and Gmail accounts periodically. I was also checking in over port 443.
Why would Gmail be using a Yahoo! Mail security certificate?
Best Answer
I find it very hard to believe that Google would ever make use-of yahoo servers. I may be wrong in this, but I suspect your browser may have run into some nasty bugs... or perhaps you have a yahoo-toolbar enabled that is doing some stuff behind-the-scenes. Can you give me an example of what you were doing/where you went... or what you were looking at? I do not see any yahoo certs in anything I do @ google. (and I manage several google-app enabled domains, use gmail, and many other things google offers.)