Obtaining certificate chain for rbscalendar.northumbria.ac.uk, one moment while we download the rbscalendar.northumbria.ac.uk certificate and related intermediate certificates...
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Revocation check via OCSP and CRL for rbscalendar.northumbria.ac.uk failed
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We could not load the certificate for rbscalendar.northumbria.ac.uk, 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.