Obtaining certificate chain for lecture.vm.cs.tcu.ac.jp, one moment while we download the lecture.vm.cs.tcu.ac.jp certificate and related intermediate certificates...
Refreshing certificate chain and revocation status for lecture.vm.cs.tcu.ac.jp, one moment while we re-check the lecture.vm.cs.tcu.ac.jp certificate and related intermediate certificates...
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Revocation check via OCSP and CRL for lecture.vm.cs.tcu.ac.jp failed
Sorry, the request for lecture.vm.cs.tcu.ac.jp could not be completed...
We could not load the certificate for lecture.vm.cs.tcu.ac.jp, 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.