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security issues with Firefox

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I am trying to access a web site and I get the insecure website message from Firefox. I know the website is good so I tell them to add exception. When I do that a message comes up that the site doesn't require an exception because they have a valid certificate, but it won't let me go on from there. I'm stuck in a loop. Please help!!

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You might try deleting any previous exceptions you created.

orange Firefox button or classic Tools menu > Options > Advanced > Encryption

If you click the View Certificates button, then the Servers tab, the site should be listed under "(Unknown)". Try deleting the certificate and seeing whether you are now allowed to add it.

For what it's worth, this is a problem with the FDA site. When sending their certificate, they are supposed to send any intermediate certificates required to complete the chain up to the trusted root certificate. IE somehow is filling in the missing link through its own magic, but Firefox requires that it be sent by the actual web server.

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The server doesn't send a required intermediate certificate.
If Firefox hasn't saved the "Cybertrust Public Issuing CA 1" on a previous visit to a site that has send it then you will get an error message.

You can contact the website to inform them about this issue and ask them to install the missing intermediate certificate.

You can inspect the certificate chain via a site like this: