Take the 2-minute tour ×
Web Applications Stack Exchange is a question and answer site for power users of web applications. It's 100% free, no registration required.

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?

share|improve this question

migrated from superuser.com Mar 28 '11 at 18:13

This question came from our site for computer enthusiasts and power users.

    
i have been looking at the traffic with Paros Proxy, and it looks like i am only contacting valid URLs that you would expect to be attached to google or yahoo. And i have Firefox set to ask about SSL certs, like it gives me an alert from Paros, but obviously this is to be expected. I just thought it was weird that google was using yahoo-domain certs –  bboyreason Mar 28 '11 at 19:05
    
What happens if you run ping -c 2 mail.google.com from a command prompt? I'm looking specifically for the IP address in the output. –  Jack M. Mar 29 '11 at 22:20
    
@jack: i am getting 74.125.67.19, i guess this is correct. Thanks for the tip. –  bboyreason Mar 30 '11 at 20:33
    
Still probably worth checking your proxy and hosts files for awkward settings. –  Jack M. Mar 30 '11 at 20:41
    
@jack: everything is looking normal there, UNLESS I HAVE A SEVERE ROOTKIT REDIRECTING SYSTEM CALLS! only kidding, still was a weird issue though. Apreeesh –  bboyreason Mar 30 '11 at 21:44
add comment

1 Answer

up vote 3 down vote accepted

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.)

share|improve this answer
    
@:thecompwiz: all i have to do is just open up firefox with my webmailnotifier password. This add-on stores my passwords for a few email sites and automatically checks them periodically. So all i have to do is sit there and occasionally i get this msg. But the window actually says that google.mail.com is using the above mentioned servers. Could gmail be redirected in this manner? i do have a ymail account in webmail notifier, however –  bboyreason Mar 28 '11 at 22:28
    
It is possible to setup yahoo mail to check gmail for mail, however this is done behind-the-scenes. I.e. Yahoo connects to google's servers and logs in as you and downloads emails directly from google. I have never heard of this "webmailnotifier" tool you're talking about... so I cannot be sure what is going on with it, but something REALLY doesn't sound right. Have you checked for virii/rootkits on your machine lately? It's possible your certificate store has also gotten corrupted or possibly you inadvertently installed a bad cert. Are you behind any kind of enterprise-flavored firewall? –  TheCompWiz Mar 29 '11 at 14:17
    
yeah i was compromised for a while. i have since installed sophos anti-virus and scanned but that doesnt do much unless the attacker is a complete idiot. After scaring the s**t out of a suspect, he deleted a bunch of XML lib files that allow for code execution. I am not sure what else remains though. I know who it is(from a business i worked at) and even have evidence(excel file emailed as attachment) but i dont know what to do. I currently am checking stuff from a home network with basic firewall/router –  bboyreason Mar 29 '11 at 15:37
    
the only certs i have are from 'authorities' if that makes a difference –  bboyreason Mar 29 '11 at 15:46
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.