XDMCP is a remote desktop protocol. With XDMCP, one computer A running X11 can connecting computer B running X11, and interact with. In this article, I will show you how to configure your Linux system to use graphical (GUI) login with XDMCP service to access remote GUI. 1 Setup Graphical Logins [xdmcp] Enable=true Port= Then launch XDM as root, e.g. xdm -config /etc/X11/xdm/archlinux/xdm-config.

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XDMCP also needs to be implemented by the display manager.

XDMCP is analogous to telnet, and therefore they share the same security issues. Over wireless, anyone can listen to your traffic and easily record your keystrokes. They can likely read what is being display on your screen.

Over a wired LAN, this is more difficult but still possible. Over both, it is still somewhat easy for someone hijack your session and assume control of the sever.

Also, consider using alternatives that feature security and often compression such as NX. XDMCP uses a large amount of bandwidth because it uses no compression. A mbit wired network may be necessary. However, the lack of compression can make XDMCP provide very fast graphics when the bandwidth is available.


These instructions are not officially documented and therefore this functionality may be considered a work in progress. This author believes that this functionality is indeed a work in progress because he has observed the following bugs: An inability to login by default with Xming clients at least. An inability of Xnest clients cdmcp reconnect.

GDM and XDMCP configuration for remote graphical Linux desktop access

The server reports that the maximum number of sessions from a host have been reached, even though the session has been entirely ended. The only workaround is to restart GDM by following the instructions to do that below.

The default display you are using is: Option -fullscreen will run Xephyr in full screen mode. It appears to work on bit Windows 7 as well. First download it from sourceforge and install it.

You can then connect to server with IP address of This includes -wgl for 3d acceleration; using Xming. Please note, do not run any 3d programs as that program will crash, leave a black box for the area of the session, and you will have to kill nowto 3d program manually.


xdmcp – Ubuntu Wiki

The default kill level does not ,inux, although kill -5 does. To make connecting to a specified server more convenient, you can browse to the regular Xming shortcut in the start menu.

Copy and paste it to the Xming folder. Then edit the copy of the shortcut by right-clicking and going to properties.

CentOS / RHEL 6,7 : How to enable or disable XDMCP service (GDM)

Edit the name under the general tab to be whatever you want. Edit the target under the shortcut tab to be what is listed in the above examples remove the default switches like -multiwindow. Cygwin with X for Windows The Ubuntu help pages have extensive documentation on this more complex client here. Xephyr does not support GLX extension starting from Partners Support Community Ubuntu.