When I attempt to connect to any site that uses an HTTPS connection (e.g. https://www.google.com), I get a 'This Connection is Untrusted' error. I'm using FF 42.0.
I followed the instructions in the The certificate is not trusted because the issuer certificate is unknown
section of the "This Connection is Untrusted" error message appears – What to do page–essentially deleting the cert8.db
file located in my Firefox profile folder (when FF was closed, BTW).
I restarted FF, but the problem persists.
Chrome (46.0.2490.86 m) and IE (10.0.9200.17519CO) work as expected.
What am I missing?
** edit **
For some reason, the '' option is presented for https://www.google.com, so I'm posting the certificate for https://www.yahoo.com instead (same error).
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Best Answer
Looks like you have some bad certificates in your Firefox store. Here is the certificates from yahoo.com and google.com for my browser. You'll see that they are from a trusted certificate authority -- VeriSign and GeoTrust, where yours is from SHC Issuing CA.
The only other thing that might be happening is SSL inspection if your computer is on a corporate network and they have some kind of appliance that does SSL Inspection. But this is unlikely since it works fine with IE and Chrome.
Yahoo Certificate
Google Certificate
Have a look at this article from Firefox on how to fix the issue. https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message
I would be trying to delete the cert8.db file:
Failing that I would be uninstalling and reinstalling Firefox.
Also do a virus scan to check if something bad has infected your browser, just for piece of mind.