Hi Jeff, The test I just ran was done with NO custom callback : SSL_CTX_set_verify( pCtx, AUTH_REQUIRE, NULL ); with AUTH_REQUIRE defined as ( SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT ) -----Message d'origine----- De : Jeffrey Walton [mailto:noloader at gmail.com] Envoy? : samedi 27 f?vrier 2016 23:48 Does your server use the default verify callback? Or does it have a custom callback? (The original question uses the default verify callback).