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Configuring XDMCP on RedHat Linux

by Jeff Hunter, Sr. Database Administrator

The xdm (X Display Manager) command manages a collection of X displays, which may be on the local host or remote servers. The design of the xdm command was guided by the needs of X terminals as well as the X Consortium standard XDMCP, the X Display Manager Control Protocol.

On RedHat Linux, these services are not turned on by default. This document provides details of the files that need to be changed in order to configure the XDMCP.

• To do this, edit the /etc/X11/xdm/Xaccess file and open the connection to hosts by un-commenting the line:

    #*  #any host can get a login window

  or enter individual IP addresses of selected hosts.

• Next, open the file /etc/X11/xdm/xdm-config and comment out the line:

    DisplayManager.requestPort: 0

• Make sure to run the program xdm as the "root" user account.

    # xdm &

• If things still do not work, you may have to reboot the server or restart the xdm if it was already running.