This application is used to test SSL ciphers/protocols. It has some specific functionality for sip, ftps, pop3 and smtp and also tests for renegotiation. The binaries (in the debug-folder) ships with OpenSSL 1.0c dlls for win32. A separate test-tool enables testing for all possible ciphers allowed by protocols (not just OpenSSL-recognized-ciphers). Now there are also some tests for the Microsoft PCT protocol.
Source: SSLDiagnos 0.8.1b
