Yahoo mail gives unreliable connection error

When I log into Yahoo mail on Firefox 40.0.3 (on Windows 7) on my laptop provided by company, I get this message:
"You asked Firefox to connect safely to we - mg5.mail.yahoo.com, but we cannot confirm that your connection is secure."

I can't create an exception:
"This site uses HTTP Strict Transport Security (HST) to specify that Firefox didn't connect safely. As a result, it is not possible to add an exception for this certificate. »

"Technical details" section states:
"we - mg5.mail.yahoo.com uses an invalid security certificate.".
The certificate is not trusted because the issuer certificate is unknown.
The server may not send the appropriate intermediate certificates.
A certificate of origin additional should be imported. (Error code: sec_error_unknown_issuer) »

Happening at home, so the mobile society has something to do with it, but, even on the phone company, I don't have this problem when you use Chrome, is not that the company does not have access outside mail.

On Firefox, the problem is intermittent. Sometimes, there are no problems and everything works fine.
Clear the cookies/history/cache and restarting does not solve the problem. Sometimes goes his own for some time, he returned.

I searched on each database, I was able to find answers, but still found no solution. The computer's clock is correct, I don't use Avast, etc. (certain other situations I ran everywhere).

I hope I can get this resolved, because I would rather continue to use FF, which I've used for years to switch to Chrome.

Thanks for your help in advance.

Sorry, I could have been uncertain. An important detail that I realize there would not have been obvious unless you looked very closely the first screenshot. The certificate you want to export is the one above the certificate of Yahoo in the dialog box, the certificate of proxy who vouch for the false certificate of Yahoo. That one will be important?

Tags: Firefox

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