Command to check if particular server URL supports forward secrecy

 These ciphers are employed if Forward Secrecy is supported by server

 openssl s_client -connect server.com:443 -cipher "ECDHE, EECDH"

 openssl s_client -connect server.com:443 -cipher "DHE, EDH"

If the command results in a “sslv3 alert handshake failure” error, the Forward Secrecy property is not supported by the server.