LinuxQuestions.org - XDMCP not working in ubuntu 12.04. Help.

I have enabled xdmcp in ubuntu 12.04.2 and this is the line from lightdm.conf

Code:

#cat /etc/lightdm/lightdm.conf



[SeatDefaults]

greeter-session=unity-greeter

user-session=ubuntu

autologin-user=

[XDMCPServer]

enabled=true

I have rebooted the ubuntu desktop. I have installed xcygwin in my windows 7 desktop. Now when i do a xlunch and try a xdmcp login, it gives me blank screen. I tried launching xserver and from terminal when i do a ssh -Y ashwin@192.168.2.3 and login and launch a X application, i can see the remote application on local display. So xserver on remote and local is working fine. So something is blocking. IS there any firewall changes i have to make or configuration setting i have to change ?

--ashwin