To verify the revocation status of certificates, the firewall uses Online Certificate Status Protocol (OCSP) and/or certificate revocation lists (CRLs). For details on these methods, see Certificate Revocation If you configure both methods, the firewall first tries OCSP and only falls back to the CRL method if the OCSP responder is unavailable. If your enterprise has its own public key infrastructure (PKI), you can configure the firewall to function as the OCSP responder.

The following topics describe how to configure the firewall to verify certificate revocation status: