Enable XDMCP protocol in Terminal Server Client ubuntu

XDMCP (X Display Manager Control Protocol) to provide a solution for the X-Terminal and to provide a platform of efficient Remote X Apps environment.

To enable XDMCP in ubuntu install xnest using command
sudo apt-get install xnest

after installing xnest
Navigate to Application---> Internet ---> Terminal Server Client
XDMCP protocol is enable in Terminal Server Client in utility