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I'm browsing from behind a Firewall using this weird proxy server, which essentially acts like a man-in-the-middle and switches up the SSL certificate of the server with its own. So the certificates regard the site I'm after, but are supposedly issued by "FooBar inc." (that's the organization I'm in).

This means that essentially every single page which FF tries to get - it believes it encounters an error, about how the sufficient type in not set, and I get:

Warning: Potential Security Issue Ahead

etc. etc.

SECURITY_ERROR_UNKNOWN_ISSUER

I tried exporting the certificate and importing it, as suggested here - but this didn't work. Trying to import the .crt I got a message saying that this was not a valid issuer.

What can I do?

Note: I'm using CentOS 8.

einpoklum
  • 10,666

1 Answers1

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What I did eventually is fire up Chromium. It essentially has the same issue, but - it was willing to let me export the Certificate Authority information. And luckily, Firefox was willing to import that information into its set of trusted Certificate Authorities - and the problem is now solved.

(Ok, not really, because I have to blindly trust websites, but at least usability-wise.)

einpoklum
  • 10,666