Problem with xdmcp

["Christopher Knorr" <cknorr trapsystems com>]

We have successfully installed RHEL4. From my WindowsXP machine I can
successfully telnet to the machine. I can also create xterm windows
using an application package on my Windows machine called WebTermX. My
problem is when I try to use WebTermX to create an XDMCP session to the
Linux machine.

When I choose to create an XDMCP session I *do* see the Linux machine in
the list of available servers. When I select it I *do* get a login box
that has tabs for things like 'Session', 'Language', etc. The problem is
that after I enter a valid username/password I never get anything else
back! It just goes "out to lunch" -- nothing. No windows. No errors. No
nothing.

Can anyone give me a pointer to a troubleshooting guide or maybe offer a
suggestion? Maybe it's something as simple as the WebTermX (and
accompanying X Server) doesn't work with Linux's gdm? If so can someone
give a recommendation on what they use?

Thanks!

Chris