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