Chrome is reporting GMail has Invalid Server Certificate, how do I find out who's fiddling with my certs?

Posted by chillitom on Super User See other posts from Super User or by chillitom
Published on 2012-04-01T08:28:01Z Indexed on 2012/04/08 11:34 UTC
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Chrome is giving the following warning when ever I try and visit GMail or a bunch of other SSL sites.

Invalid Server Certificate
You attempted to reach mail.google.com, but the server presented an invalid certificate.
You cannot proceed because the website operator has requested heightened security for this domain.

This is the certificate the Chrome reports as invalid:

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

I think someone or something (proxy, anti-virus, browser extension) is snooping on my SSL traffic.

How can I determine who/what is doing this?

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