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