OCSP is the on-line certificate status protocol. It is used to determine the validity of a given certificate. An error exists in the OCSP client implementation such that certain OCSP requests are immediately rejected by the OCSP server. The error occurs during validation of a certain class of certificates: those that have been issued by a CA that is not a root CA. A root CA has a certificate where the subject name and issuer name are identical. OCSP validation requests for certificates issued by root CAs do not exhibit the problem. When the error occurs, the OCSP validation request is encoded incorrectly and the request is subsequently rejected by the OCSP server.
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