Obtaining certificate chain for dexch.o2.cz, one moment while we download the dexch.o2.cz certificate and related intermediate certificates...
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Revocation check via OCSP and CRL for dexch.o2.cz failed
Sorry, the request for dexch.o2.cz could not be completed...
We could not load the certificate for dexch.o2.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.