I'm having a heck of a time getting RDP support to work on some SLES 11 SP2 servers. I have one in my lab that works if I RDP into it using CoRD from my Mac and login as root, but not Microsoft's RDP client. I have another that I cannot RDP into at all no matter what I put in for a user and password. In all cases, when it fails, I get a box that says:

connecting to sesman ip port 3350
sesman connect ok
sending login into to sesman
login failed

What trick am I missing here? What does this mean exactly and how do I troubleshoot it? I'm finding little info on this. Thanks.