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CA Signed Certificate shows as "not valid"

  • 4 replies
  • 1 has this problem
  • 1 view
  • Last reply by jCubed

jCubed
jCubed
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There is a certificate for an internal website that FireFox is saying is not valid/secure and it makes you add an exception. However, if you use IE, Edge or Chrome it loads fine with the valid CA Certificate. I've cleared all data (cache/etc...) and it hasn't fixed it. Hopefully someone has a fix for this?

Getting "SEC_ERROR_UNKNOWN_ISSUER" for the certificate and its saying: 

   Peer’s Certificate issuer is not recognized.
   HTTP Strict Transport Security: false
   HTTP Public Key Pinning: false


FireFox Version: 91.8.0esr (64-bit) Operating System: Windows 10 (64-bit)

There is a certificate for an internal website that FireFox is saying is not valid/secure and it makes you add an exception. However, if you use IE, Edge or Chrome it loads fine with the valid CA Certificate. I've cleared all data (cache/etc...) and it hasn't fixed it. Hopefully someone has a fix for this? Getting "SEC_ERROR_UNKNOWN_ISSUER" for the certificate and its saying: Peer’s Certificate issuer is not recognized. HTTP Strict Transport Security: false HTTP Public Key Pinning: false FireFox Version: 91.8.0esr (64-bit) Operating System: Windows 10 (64-bit)

Modified by jCubed

Chosen solution

Firefox does not use the operating system certificate store by default.

Can you go to about:config and search for the preference

security.enterprise_roots.enabled

and change it to true and see if that fixes things?

Read this answer in context 👍 1

All Replies (4)

Mike Kaply
Mike Kaply
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Chosen Solution

Firefox does not use the operating system certificate store by default.

Can you go to about:config and search for the preference

security.enterprise_roots.enabled

and change it to true and see if that fixes things?

jCubed
jCubed Question owner
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So, that fixed it, thanks! But why would that matter? The certificate is loaded to the server itself. The certificate was not loaded to GPO, windows store or anything else. Only applied to the server itself.

Mike Kaply
Mike Kaply
  • Moderator
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My guess is that your company uses a custom certificate authority for that site (not a public one) and they load that CA into Windows expecting it to work.

jCubed
jCubed Question owner
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That could be. Just not disclosed to us after its generated on specifically what they did. Thanks!