Hi, I am building a server application that allows a user to log in by providing a certificate. In order to do custom checks, I have added a verify callback to my code to check the certificate on top of its cryptographic features (CA Valid, etc). If the certificate does not pass my extended checks, I would like to return the access_denied alert as per RFC8446 section 6.2: access_denied: A valid certificate or PSK was received, but when access control was applied, the sender decided not to proceed with negotiation. However, I can't find a way to generate this alert in openssl, although openssl can handle receiving it. How do I make a callback return a non-defined (as in not defined in the headers) alert? Best regards, Christian