Sorted:

XDMCP Fails After Login Screen

Load Balancing with XDMCP

LIVE Error: Address in Use

XDMCP Session Failed for Display

XDMCP: Manager Unwilling: Host Unwilling

Session declined: Maximum Number of Sessions Reached

What Ports Need to be Opened for XDMCP

Enable XDMCP on Solaris 9 and Below

Enable XDMCP on Solaris 10

Enable XDMCP By Editing Files

Enable XDMCP Using Yast2

Enable XDMCP using gdmsetup

How to Enable XDMCP on Unix