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