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