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CA Signed Certificate shows as "not valid"

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 loa… (tuilleadh eolais)

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)

Asked by jCubed 1 bhliain ó shin

Answered by Mike Kaply 1 bhliain ó shin