If you're trying to ssh behind a proxy (especially a Microsoft ISA proxy), you may be out of luck. Unless, that is, you use Proxifier. This little gem makes it a breeze to "proxify" all your applications, even if the applications themselves have no idea how to commuicate through an ISA proxy. I have been using it for a week, and it works like a charm. Git, ssh, etc. it all works. Kudos to the team for writing such a useful tool - it's completely worth $39.95.