This was due to a change in the X server to disable listening on TCP by default:
http://cgit.freedesktop.org/xorg/xserver/commit/?id=cc59be38b7eff52a1d003b390f2994c73ee0b3e9
** Changed in: lightdm (Ubuntu)
Status: New => Triaged
** Changed in: lightdm (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1449282
Title:
xserver-allow-tcp features doesn't work with Xorg version 1.16.0
Status in lightdm package in Ubuntu:
Triaged
Bug description:
In order to enable X11 forwarding from an external host you must
explicitly set the Xserver to listen by overriding the xserver-
command. Previously you could set the xserver-allow-tcp=true and it
would do this automatically.
I would have expected this change in behaviour to show up in
README.Debian.gz but since it did not, perhaps the functionality of
the "xserver-allow-tcp=true" is not working as expected.
Below shows my before (no TCP listener on 6000) and after (TCP
listener on 6000) lightdm.conf to re-enable the listener after the
15.04 upgrade.
Before (14.10):
~$ cat /etc/lightdm/lightdm.conf
[SeatDefaults]
xserver-allow-tcp=true
After (15.04):
~$ cat /etc/lightdm/lightdm.conf
[SeatDefaults]
xserver-command=X -core -listen tcp
xserver-allow-tcp=true
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: lightdm 1.14.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Apr 27 17:33:26 2015
InstallationDate: Installed on 2014-12-18 (130 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
LightdmConfig:
[SeatDefaults]
xserver-command=X -core -listen tcp
xserver-allow-tcp=true
SourcePackage: lightdm
UpgradeStatus: Upgraded to vivid on 2015-04-27 (0 days ago)
###########################################
i haven't /etc/lightdm/lightdm.conf
when i tried to create it and write the lines above it was worse, my system
didin't start.
after a few experiment i have found something that works:
i change my /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
before it was:
[SeatDefaults]
# Dump core
xserver-command=X -core
now:
[SeatDefaults]
# Dump core
xserver-command=X -core
xserver-allow-tcp=true
and it works!
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