How to export terminal to F9 using r-tools?

[Marcelo M. Garcia]

Hi

How do I enable my Fedora 9 (x86) to accept terminals from other 
machines using r-tools? I cannot use ssh -X in this case.

I tried to configure using /etc/gdm/custom.conf in the "xdmcp" option:
Enable=true
Port=177
but it is not working.

Thanks

Marcelo