Obtaining certificate chain for vstudy.co.kr, one moment while we download the vstudy.co.kr certificate and related intermediate certificates...
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Revocation check via OCSP and CRL for vstudy.co.kr failed
Sorry, the request for vstudy.co.kr could not be completed...
We could not load the certificate for vstudy.co.kr, 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.