Can any help in this issue, it would be really appreciated. I did the following, but it didnt help.... For XDMCP connection to Red Hat 5 EL 1. XDM Configuration 1. Change runlevel to 5 Open/etc/inittab and set the initial runlevel to 5 as following: id:5:initdefault: 2. Enable XDMCP For GDM: Open /etc/gdm/custom.conf and set the Enable entry to 1 in the [xdmcp] section as following. [xdmcp] Enable=1 For KDM: Open /usr/share/config/kdm/Xaccess and remove the initial "#" character for the following line: #* #any host can get a login window ==> * #any host can get a login window Open /usr/share/config/kdm/kdmrc and set the Enable entry to true in the [xdmcp] section as following. [xdmcp] Enable=true 2. Firewall (TCP/UDP Ports) Configuration Open UDP port 177 from the PC to the remote host direction. Open incoming TCP ports 6000~6010 from the remote host to your PC. 3. Reboot the remote host and start Xmanager # init 3; init 5