Firefox cannot recognize certificates for well knows sites

Posted by RCola on Super User See other posts from Super User or by RCola
Published on 2013-09-29T17:17:59Z Indexed on 2014/06/06 3:29 UTC
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firefox

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certificate

When trying to connect to well known sites, for instance hotmail.com Firefox shows that This Connection in Untrusted. In the Options>Advanced>Certificates it's configured to select one matching certificate automatically. Why Firefox does not trust current connection? Can it be Man-in-the-middle attack or it's something like broken certificate storage on my computer?

enter image description here

UPDATE enter image description here

UPDATE2

Solved: the problem is Antivirus Web Access protection. It interferes with HTTPS connection. Similar to Man-in-the-middle? Why ESET cannot do it correctly? enter image description here

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