Obtaining certificate chain for exch.osot.com, one moment while we download the exch.osot.com certificate and related intermediate certificates...
Refreshing certificate chain and revocation status for exch.osot.com, one moment while we re-check the exch.osot.com certificate and related intermediate certificates...
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Revocation check via OCSP and CRL for exch.osot.com failed
Sorry, the request for exch.osot.com could not be completed...
We could not load the certificate for exch.osot.com, 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.