I am planning to setup a terminalserver for my *nix based administrators.I would like to have a number of users, either with gnome or with kde (based on their likings) who will connect to the server and start their individual settings on the same machine.What I found out so far:Just forwarding X11 via SSH is very slow (using port TCP 22, ssh)VNC is slow (using ports TCP 5900 onwards, vnc:0 ...)KDE-Remote seems to be fast, propably same with gnome (using port UDP 177, xdmcp)To enable remote login I need to modify /etc/gdm/custom.conf:[security]DisallowTcp=false[xdmcp]Enable=true/etc/X11/xdm/Xaccess needs to be modified, too (enter a pattern for hosts that are allowed to get a remote login window).Now so far, if I enable both settings, I can use XDMCP to connect to the server, but I am getting a black screen with a simple mouse-cursor consisting of a white cross.So there are some ingredients still missing here.Any pointers or own configurations out there that can help me here are welcome. 
How to setup a KDE/Gnome-Remote-Server with CentOS 6
centos;remote desktop