Firefox - "This Connection is Untrusted" Error in Firefox 9

"This Connection is Untrusted" Error in Firefox 9

Q

Why I am getting the "This Connection is Untrusted" error screen in Firefox 9?

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A

You will see the "This Connection is Untrusted" error screen in Firefox 9, if Firefox failed to validate the server certificate provided by the Web site you are visiting. One of the reason for the validation failure is missing the root CA certificate in Firefox as shown in this tutorial:

1. Run Firefox 9 and go to "Tools > Options" menu.

2. Click "Advanced > Encryption" tab and "View Certificates" button.

3. Click "Authorities" tab and select "VeriSign Class 3 Public Primary Certification Authority - G5".

4. Click "Export..." button to save a copy of this CA certificate to a file called "VeriSignCA.crt".

5. Click "Delete or Distrust..." button to delete it from Firefox.

6. Visit Web site "https://www.paypal.com". You see the "This Connection is Untrusted" error screen showing up. Firefox 9 - This Connection is Untrusted

We know why. We deleted the root CA certificate from Firefox.

⇒ Add Certificate Validation Exception in Firefox 9

⇐ List of Root CA Certificates Used by Firefox 9

⇑ Tutorials for Older Versions of Firefox

⇑⇑ Firefox Certificates Tutorials

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