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XDMCP connection fails for Linux. How do I configure my Linux box?

XDMCP connection fails for Linux. How do I configure my Linux box?

May 03, 2018

How to configure Linux XDMCP(KDE/GNOME) settings for Xmanager:

Affected Files

For runlevel :  

/etc/inittab

For GDM :

/etc/X11/gdm/gdm.conf
/etc/gdm/custom.conf (Fedora Core 5)

For KDM :

/etc/X11/xdm/xdm-config
/etc/X11/xdm/Xaccess
/etc/X11/xdm/kdmrc
/usr/share/kdm/kdmrc
/usr/share/config/kdm/kdmrc
/etc/opt/kde2/share/config/kdm/kdmrc

For Firewall :

/etc/sysconfig/ipchains

Step 1. Change runlevel to enable gdm or kdm.

  1. Open /etc/inittab file.

  2. Change the runlevel to 5 as following:

    id:5:initdefault:

Step 2. GDM configuration (When the Linux is using gdm)

  1. Open /etc/X11/gdm/gdm.conf file. (/etc/gdm/custom.conf for Fedora Core 5)

  2. Go to the [xdmcp] section.

  3. Set the value of Enable option to true or 1.

 

Step 3. KDM configuration (When the Linux is using kdm)

  1. Open /etc/X11/xdm/xdm-config file.

  2. Comment out "requestPort" option as following:

    DisplayManager.requestPort: 0  ==>  !DisplayManager.requestPort: 0

  3. Open /etc/X11/xdm/Xaccess file.

  4. Remove the initial "#" character for the following line:

    #* #any host can get a login window ==> * #any host can get a login window

  5. Open /etc/X11/xdm/kdmrc,

    /usr/share/config/kdm/kdmrc or
    /etc/opt/kde2/share/config/kdm/kdmrc file.

  6. Change the value of "Enable" option to "true".

 

Step 4. Firewall configuration (If the firewall has been configured)

  1. Open /etc/sysconfig/ipchains file.

  2. Add the following lines at the top of the file:

    -A input -p udp -s 0/0 -d 0/0 177 -j ACCEPT -A input -p tcp -s 0/0 -d 0/0 telnet -j ACCEPT -A input -p tcp -s 0/0 -d 0/0 ssh -j ACCEPT -A input -p tcp -s 0/0 -d 0/0 login -j ACCEPT -A input -p tcp -s 0/0 -d 0/0 exec -j ACCEPT -A input -p tcp -s 0/0 -d 0/0 shell -j ACCEPT -A input -p tcp -s 0/0 -d 0/0 7100 -j ACCEPT

Step 5. Restart your Linux to activate the changes.