How do I enable the X Display Manager Protocol (XDMCP) for Red Hat Enterprise Linux 3?

Updated -

Release Found: Red Hat Enterprise Linux 3

Symptom: X Window System clients are unable to get a graphical login from the server.

Solution: Enable the X Display Manager Control Protocol (XDMCP) in GDM (the default X display manager).

Note: XDMCP is by no means a secure protocol. It also tends to be quite ban...

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