Before making the request, client uses AIA extension to check whether OSCP is configured, and if yes what is the OSCP responder location. This article shows you how to manually verfify a certificate against an OCSP server. It then caches its response based on the remaining TTL of the base and delta CRL that were used. Query … "Query OCSP responder servers to confirm the current validity of certificates" So I guess it's likely this abuseipdb is being exploited to sow fear? 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. Checking the revocation status of SSL/TLS certificates presented by HTTPS websites is an ongoing problem in web security. OCSP allows that status check to occur. The ocsp command performs many common OCSP tasks. It is possible to work-around this with the undocumented -header switch as shown below. 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. OCSP CLIENT OPTIONS -out filename specify output filename, default is standard output. It is an alternative to the CRL, certificate revocation list. Online Responder (Or OSCP Responder) is the server component, which accepts requests from OCSP client to check the revocation status of a certificate. Hornsj2. certutil -urlcache CRL delete The OCSP responder formulates its OCSP response based on the current CRL (base and delta). In order to see a certificate’s status, a web browser makes a query. 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. Theoretically, Microsoft OCSP Server can work with different revocation providers. Advanced OCSP products provide the ability for the OCSP to query a CA’s database directly. OCSP stapling allows the certificate presenter (i.e. That query is sent is an OCSP server. The OCSP server sends a response back – think of it as a bespoke CRL for the client. OCSP stands for the Online Certificate Status Protocol and is one way to validate a certificate status. 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. 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. 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. Using openssl ocsp (client) to verify a certificate fails when the responder requires host header.. 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