Enabling XDMCP in Ubuntu 11.04

XDMCP is X Display Manager Control Protocol

1. install xdm

(If you installed xdm before, pass this step)

#apt-get install xdm

2. Edit /etc/gdm/custom.conf as follow: (If custom.conf is not exist, make it)

#vim /etc/dgm/custom.conf

[daemon]

User=gdm
Group=gdm

[security]
DisallowTCP=true

[xdmcp]
Enable=true
DisplaysPerHost=2
HonorIndirect=false
MaxPending=4
MaxSessions=16
MaxWait=30
MaxWaitIndirect=30
PingIntervalSeconds=60
Port=177

[greeter]

[chooser]
Multicast=false

[debug]
Enable=false

3. restart gdm or restart linux

http://happybruce.tistory.com/827

http://ubuntuforums.org/showthread.php?t=1471703