Connection is untrusted error after update to windows 10

I recently updated my PC Windows 10. Now, on firefox, I can't connect to ANY Web site. Only, I get this message:

This connection is Untrusted

You asked Firefox to connect safely on www.youtube.com, but we cannot confirm that your connection is secure.

Normally, when you try to connect safely, sites will present a reliable identification to prove that you're in the right place. However, the identity of this site cannot be verified.
What should I do?

If you normally connect to this site without problems, this error can mean that someone is trying to impersonate the identity of the site, and you should not continue.

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.

Thanks for your help.

Hi OscarTM, what anti-virus software are you using, as some are known to intervene in this way?

This could happen in the accounts limited by family parental control of microsoft. you could turn it off for your account as described in the: http://windows.microsoft.com/en-us/windows-10/turn-off-microsoft-family-settings

in case you want to have it by intention, you would be required for some configurations in firefox and install the security certificate for the ms family that is getting used to intercept connections secured in the browser trust store.
Open this link in firefox - and must display a dialog on the addition of a cert. Please check the trust this CA to identify web sites & confirm the change.

Alternatively, you can also try the manual procedure described in https://support.microsoft.com/en-us/kb/2965142 in the section about firefox.

Tags: Firefox

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