Certificate Domain Mismatch

The server's TLS certificate is valid but was not issued for the requested hostname, so Firefox refuses the connection. Shown on the "Did Not Connect: Potential Security Issue" page.

References

searchfox.org/nss/source/lib/ssl/sslerr.h
support.mozilla.org/en-US/kb/what-do-network-error-messages-mean

In this namespace

← previous SEC_ERROR_UNKNOWN_ISSUER Unknown Certificate Issuer

— end of namespace —

NS_ERROR_UNKNOWN_HOST NS_ERROR_UNKNOWN_PROTOCOL NS_ERROR_UNKNOWN_PROXY_HOST SEC_ERROR_EXPIRED_CERTIFICATE SEC_ERROR_UNKNOWN_ISSUER SSL_ERROR_BAD_CERT_DOMAIN