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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You can test the GDM login screen locally: Proceed with caution, and although this is highly unlikely, the author s do not take any responsibility for that. Over both, it is still somewhat easy for someone hijack your session and assume control of the sever.

Table of Contents 1.

Edit the name under the general lihux to be whatever you want. Also, consider using alternatives that feature security and often compression such as NX.

The default kill level does not work, although kill -5 does. The default can also be reset using the GUI console configuration tool: Over wireless, anyone can listen to your traffic and easily record your keystrokes. Over a wired LAN, this is more difficult but still possible. First download it from sourceforge and install it. This includes -wgl for 3d acceleration; using Xming.

Naming of particular products or brands should not be seen as endorsements. A mbit wired network may be necessary. This is how I came up with this document as a way to share my experiences with all users. This may require a change to the default sshd configuration. An inability of Xnest clients to reconnect. In order to use the Linux desktop remotely, the login manager must be configured for remote use.


Older zdmcp used the X11 login manager XDM. XDMCP is not regarded as secure over a public network. The system is typically configured for a single login display xfmcp. GDM and XDMCP configuration for remote graphical Linux desktop access Linux installations default to a secure configuration which does not allow remote graphical logins or remote desktop access.

Multiple display managers can run simultaneously only if they are configured to manage different servers not covered in this tutorial. Then edit the copy of the shortcut by right-clicking and going to properties. The only workaround is to restart GDM by following the instructions to do that below.

GDM and XDMCP configuration for remote graphical Linux desktop access

The X-Terminal can be displayed with an individual window or multiple windows, based on your X window system’s software capabilities and setup. Linux installations default to a secure configuration which does not allow remote graphical logins or remote desktop access.

They can likely read what is being display on your screen. Partners Support Community Ubuntu. Linux configuration for a GUI login:. To make connecting to a specified server more convenient, you can browse to the regular Xming shortcut in the start menu. The server reports that the maximum number of sessions from a host have been reached, even though the session has been entirely ended. However, the lack of compression can make XDMCP provide very fast graphics when the bandwidth is available.

Valid options include “gdm” and “kde”. Without your submissions and input, this document wouldn’t exist.


Use of a term in this document should not be regarded as affecting the validity of any trademark or service mark. I am always looking for the best way to use Linux, both at home and in work.

Feedback Feedback is most certainly welcome for this document. XDMCP uses a large amount of bandwidth because it uses no compression. As this is a new edition of this document, there may be errors and inaccuracies, that may of course be damaging to your system. See FreeNX for a more secure alternative. Edit the target under the shortcut tab to be what is listed in the above examples remove the default switches like -multiwindow. Before you begin, some background 2. X11 Forwarding using SSH 4.

New HOWTO: Linux XDMCP HOWTO – page 2

Cygwin with X for Windows The Ubuntu help pages have extensive documentation on this more complex client here. Use the concepts, examples and other content at your own risk. Please send your additions, comments and criticisms to the following email address: This author believes that this functionality is indeed a work in progress because he has observed the following bugs: Also see the YoLinux.

XDMCP is analogous to telnet, and therefore they share the same security issues.