Query … (It's only "known" to you once you trip over it and do the research, which is annoying.). In order to see a certificate’s status, a web browser makes a query. OCSP on the other hand changes the process to a SQL like process where clients send a secure query to an OCSP Responder (server) and ask if the serial number it is looking at has been marked as revoked. Online Responder (Or OSCP Responder) is the server component, which accepts requests from OCSP client to check the revocation status of a certificate. It can be used to print out requests and responses, create requests and send queries to an OCSP responder and behave like a mini OCSP server itself. Now, uncheck the ‘Query OCSP responder servers to confirm the current validity of certificates’ option. OCSP stands for the Online Certificate Status Protocol and is one way to validate a certificate status. It is an alternative to the CRL, certificate revocation list. Before making the request, client uses AIA extension to check whether OSCP is configured, and if yes what is the OSCP responder location. Once you change the OCSP setting in Mozilla Firefox, go to command prompt and run the below commands to remove the CRL and OCSP cache. Checking the revocation status of SSL/TLS certificates presented by HTTPS websites is an ongoing problem in web security. OCSP is a mechanism for determining the revocation status of X.509 certificates. When you use default revocation provider (CRL-based), then CLSID must be {4956d17f-88fd-4198-b287-1e6e65883b19}; ProviderProperties — contains revocation provider properties, like CRL URLs and cache update duration. Theoretically, Microsoft OCSP Server can work with different revocation providers. The OCSP responder formulates its OCSP response based on the current CRL (base and delta). The ocsp command performs many common OCSP tasks. Introduction. It then caches its response based on the remaining TTL of the base and delta CRL that were used. web server) to query the OCSP responder directly and then cache the response. OCSP stapling allows the certificate presenter (i.e. OCSP Server (Responder) An OCSP server (often referred to as a responder) is a trusted server maintained by a Certificate Authority which responds to queries. This OCSP response must be from a trusted sources. OCSP servers consume CRLs in order to provide an indication of whether the certificate was revoked - in this model the OCSP must refresh the CRL on a schedule to ensure it is providing up to date revocation information. That query is sent is an OCSP server. certutil -urlcache CRL delete OCSP allows that status check to occur. Advanced OCSP products provide the ability for the OCSP to query a CA’s database directly. This is a "known" issue with startssl (startcom) responders- but it keeps tripping people up. 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