KDM XDMCP error

[Towncat <towncat.towncat@gmail.com>]

I have two lenny boxes, and I want to login to an X session on one of
them from the other using XDMCP. If I run KDM on the remote machine
and try to log in, KDM just restarts. If I run XDM on the same
machine, I can login in through XDMCP. I can also log in with KDM
locally on the remote machine. Where should I start tracing the
problem?

Thanks:
 tc