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[komputes <komputes@xxxxxxxxx>]

Found the gdm daemon to be documented in /usr/share/gnome/help-langpack/gdm/en_GB/gdm.xml although I am:
1) Unsure how a user should find this information (simplest way to access this in readable format)
2) Unsure if this works (needs testing)
3) Surprised not to see this documented elsewhere (wiki)

Below is the section this bug is concerned with. Attached is a
simplified text file of the configuration options found in the xml file
cited above.

Config file:
/etc/gdm/custom.conf

Security Options
[security]

Option:
DisallowTCP

Usage example:
DisallowTCP=true

Details:
If true, then always append -nolisten tcp to the command line when starting attached Xservers, thus disallowing TCP connection. This is a more secure configuration if you are not using remote connections.

** Attachment added: "gdm-configuration.txt"
   http://launchpadlibrarian.net/37914269/gdm-configuration.txt

-- 
No graphical way to allow TCP logins to Xserver in gdmsetup. No alternate method documented.
https://bugs.launchpad.net/bugs/498434
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Status in “gdm” package in Ubuntu: New

Bug description:
Binary package hint: gdm

There is no graphical way to allow TCP logins to Xserver. This feature was lost with the introduction of the new gdmsetup in karmic. The is no documentation on an alternate way to accomplish this task.

ProblemType: Bug
Architecture: i386
Date: Sat Dec 19 01:47:18 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: wl
Package: gdm 2.28.1-0ubuntu2.1
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-16.53-generic
SourcePackage: gdm
Uname: Linux 2.6.31-16-generic i686