XDMCP Configuration

Fedora Core 5 and Fedora Core 6

Follow the same procedure for both versions of Fedora.

Firewall

Bring down the "System" menu and choose "Administration"->"Security Level Configuration". Enter the root password when prompted. In the "Firewall Options" tab bring down the "Other Ports" field and press "Add". Add port 177/tcp and 177/udp. Now press "OK" and confirm that you want to update the firewall settings.

Display Manager

Bring down the "System" menu and choose "Administration"->"Login Screen". Enter the root password, then select the "Remote" tab of the Login Screen window (it's the program gdmsetup). Select Style to be "Same as local" then close the window.

Now it's necessary to re-start GDM. Logout of your current session, then press Ctrl-Alt-F1 to get a console. Login as root and execute the following command:

[root@localhost ~]# init 3 && init 5 

You should now be able to point an X session at your server.

Link http://www.wmltd.co.uk/index.php/products/nomachine_thin_client/setting_up_x