samba - Mar 2005 - RPC works ADS doesn't on Mandrake 10.1?

I'm trying to setup a Linux box to authenticate on Windows Active
Directory.

I have winbind and samba installed and running on Mandrake 10.1. When I
boot the PC it prompts me with all the usernames from my Windows 2000
Active Directory. After I login I can run:
net RPC TESTJOIN (works fine)

net ADS TESTJOIN (failed: Malformed representation of principal)

 

Why won't ADS work?

Carlton.