Enable XDMCP in Linux

Enable XDMCP in Linux

Release:

RedHat Enterprise Linux 5

SUSE Linux 10

Problem:

Need to enable the xdmcp protocol in the Linux server for getting remote using XBrowser.

Solution:

In RHEL Server:

1)      Install the gdm package

# yum install gdm

2)      Enable the xdmcp protocol by adding the below entries in the custom.conf file.

# vi /etc/gdm/custom.conf

[security]

AllowRemoteRoot=true

DisallowTCP=false

[xdmcp]

Enable=true

Note: Here “AllowRemoteRoot=true” used to allow root access.

3)      Restart the gdm service

# gdm-restart

4)      Check weather xdmcp port is opened or not, using netstat command

# netstat –an | grep 177

udp        0      0 0.0.0.0:177         0.0.0.0:*  

In SUSE Server:

5)      Install the required 2 packages

# yum install gdm xorg-x11

6)      Set the default display manager by editing the displaymanager file

# vi /etc/sysconfig/displaymanager

DISPLAYMANAGER="gdm"

DISPLAYMANAGER_REMOTE_ACCESS="yes"

7)      Enable the xdmcp protocol by editing the gdm.conf file

# vi /etc/opt/gnome/gdm/gdm.conf

[security]

AllowRoot=true

AllowRemoteRoot=true

[xdmcp]

Enable=true

8)      To make xdmcp listening on xdm by edit the xdm-config file

# vi /etc/X11/xdm/xdm-config

!DisplayManager.requestPort:    0

Note: Comment out this line for xdmcp listen on xdm

9)      Restart the service and check with netstat

# rcxdm restart

# netstat –an | grep 177

udp        0      0 0.0.0.0:177             0.0.0.0:*

10)   Verify from the Windows client using Xbrowser as root.