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3.1.7.2.1 Problem with Server Certificate During a Download

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During HTTPS connection setup, the client tries to find the server's certificate by querying the table of peer certificates, as described in BITS Peer-Caching: Peer Authentication section 3.2.6.1.<16> If the certificate is present in the table of peer certificates, the client proceeds with the request, otherwise, the client MUST attempt to authenticate the server by an exchange of certificates via the BITS Peer-Caching: Peer Authentication Protocol. If the client successfully exchanges certificates with the server, then the client completes the Download request with the result RESULT_SERVER_CERT_UNKNOWN. Otherwise, the client completes the Download request with the result RESULT_TRANSPORT_ERROR.