"This connection is Untrusted" appears when you try to access all sites on MacBook Pro; problem started after running Avast scan of the computer

I ran the full scan of the disc of Avast. Since then, I have been unable to access any site using Firefox without getting the message, "this connection is not approved." Many are the sites I have been too many times before, and they are trusted sites. I don't know if there is a problem with Firefox or Firefox could recover place a sort of new "infestation". The Avast scan resulted in 5 put files in a quarantine area. Eleven years could not be scanned. Thanks for any help you can provide!

I guess Safari normally works on these sites?

The latest version of avast! Web Shield includes a function to filter your Internet connections for potential threats. In order to filter secure sites, it must present a certificate of 'false' for the site in Firefox, so it can be 'in the middle' and read your secure communications. If Firefox is not set false certificates of trust, then you will get warnings for all secure sites.

You can disable this feature as a test to see if the problem goes away.

If this works, but you want to use the feature, you must import the certificate of Avast in the tab "References" of Firefox so Firefox accepts its false certificates (there might be an automated way AVAST to do this for you, or you might need export from IE and then import them into Firefox).

Here is an exchange of views on avast! "forum of s on the way in which this is supposed to work: problems and questions about HTTPS scanning - Avast Internet 2015

Tags: Firefox

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