SSLScan

How do you know which ciphers your SSL service supports? The best way to find out is to ask, and that’s exactly what SSLScan does. SSLScan is a command-line tool that, given an address and port, will generate a long list of ciphers and report whether the SSL service at the location accepted or rejected them.

You can find a Windows port here. The tool also displays preferred ciphers, supported protocols, and the server’s SSL certificate.