What is Sec_error_unknown_issuer self-signed?
What Does SEC_ERROR_UNKNOWN_ISSUER Mean? The error code SEC_ERROR_UNKNOWN_ISSUER is meant to tell users that a website is attempting to use an SSL certificate that was issued by an untrusted entity.
What is Security Sec_error_unknown_issuer in Firefox?
If you click the Advanced button on a "Warning: Potential Security Risk Ahead" error page and you see the error code SEC_ERROR_UNKNOWN_ISSUER or MOZILLA_PKIX_ERROR_MITM_DETECTED, it means that the provided certificate was issued by a certificate authority that is not known by Firefox and, therefore, cannot be trusted ...