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After Firefox update, Firefox wrongly report SSL_ERROR_BAD_CERT_DOMAIN, but the certificate CN and Domain DO match. What could the problem be?

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We use a Certificate Authority for our internal network, that we have setup on the .lan domain.

We install our certificate authority Root certificate in OS and Firefox and instruct it to trust it for website certificates.

This has been working just fine, until the latest firefox update (or its components), after upgrading to Fedora 25.

No, it is complaining about BAD CERT DOMAIN.

The root certificate is there, and trusted, The certificate CN and hostname match perfectly. The certificates are valid (timewise).

Any idea what could be going wrong?