Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

CA Signed Certificate shows as "not valid"

  • 4 replies
  • 1 has this problem
  • 443 views
  • Last reply by jCubed

jCubed
jCubed
more options

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
  • Top 25 Contributor
  • Moderator
more options

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
more options

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
  • Top 25 Contributor
  • Moderator
more options

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
more options

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