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João Pinto
Asked: 2010-11-04 07:16:04 +0800 CST

How to use XDMCP+GDM and Xnest?

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I have been trying to enable XDMCP on GDM without much success. Following some instructions I have edited /etc/gdm/custom.conf and added:

[daemon]
RemoteGreeter=/usr/lib/gdm/gdm-xdmcp-chooser-slave
[xdmcp]
Enable=true

Then restarted gdm and tried to connect both locally and from a remote system with:

Xnest :1 -query localhost
Xnest :1 -query remote_system_hostname

I just get a black screen instead of the GDM window as expected. I am missing something ?

10.10 gdm xdmcp

2 Answers

  1. Best Answer
    • 3

  2. For LightDM which is in the latest Unity based Ubuntus I used this answer: XDMCP setup for lightdm, ports not listening

    And you will probably need to also add the SeatDefaults setting in the answer i.e.

    [SeatDefaults]
xserver-allow-tcp=true

    And you may also need to enable access to your local server by using 

    xhost +<remote hostname>

    or just 

    xhost +

    to disable it completely

    • 1