A while back I tried to get my AIX servers to talk to some Windows servers in their secure protocol. It is called ftps (Secure FTP) and appear be build on a higher version of ssl with tds encryption. It seemed that the only way this was possible from AIX was by using curl with special ssl encryptions set. This month, The Written Word claims to have a compile of this. Last time I tried a demo of their stuff, it core dumped on me, but maybe this is better:

The Written Word