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Revocation check via OCSP and CRL for zonemaster.labs.nic.cz failed
Sorry, the request for zonemaster.labs.nic.cz could not be completed...
We could not load the certificate for zonemaster.labs.nic.cz, it might not exist or we could not reach the server, complete the TLS handshake, etc.
Revoked certificates can't and should not be trusted, these certificate will cause errors like "NET::ERR_CERT_REVOKED" in browsers and expose a security risk.