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