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Error code: sec_error_untrusted_issuer but 'This site provides valid, verified identification.'

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I cannot access GMail because I get the 'This Connection is Untrusted' page.

The Technical Details are: uses an invalid security certificate. The certificate is not trusted because the issuer certificate is not trusted. (Error code: sec_error_untrusted_issuer)

If I click 'Add Exception', in Certificate Status, it says, 'This site provides valid, verified identification. There is no need to add an exception.'

My machine is on a corporate site, behind a firewall and proxy server. The proxy server substitutes the certificate so although it's called, it's issued by our internal CA. I've added the internal CA certificate to the Authorities list (by importing it to Servers and then selecting 'Trust the authenticity of this certificate').

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Make sure you have SSL and TLS on, they are in the advanced options menu.



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Try to remove that CA certificate and re-import it once again.

You can also try to delete or rename the cert8.db file before importing this proxy CA certificate.

Did you place a tick in all trust bits (Edit)?