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[Launchpad Bug Tracker <1449282@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lightdm - 1.14.4-0ubuntu1

---------------
lightdm (1.14.4-0ubuntu1) vivid; urgency=medium

  * New upstream release:
    - Handle XDMCP Request packet with no addresses. (LP: #1516831)
    - Don't start LightDM if the XDMCP server is configured with a key that
      doesn't exist. (LP: #1517685)
    - Add IP addresses to XDMCP log messages.
    - Refactor XDMCP error handling.
    - Add more tests.

 -- Robert Ancell <robert.ancell@xxxxxxxxxxxxx>  Fri, 20 Nov 2015
16:01:15 +1300

** Changed in: lightdm (Ubuntu Vivid)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1449282

Title:
  xserver-allow-tcp=true feature doesn't work with Xorg version 1.17.0

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.10 series:
  Fix Committed
Status in Light Display Manager 1.14 series:
  Fix Released
Status in Light Display Manager 1.16 series:
  Fix Released
Status in Light Display Manager 1.2 series:
  Won't Fix
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Trusty:
  Fix Released
Status in lightdm source package in Vivid:
  Fix Released
Status in lightdm source package in Wily:
  Fix Released

Bug description:
  [Impact]
  xserver-allow-tcp=true option no longer works with X.org 1.17.

  [Test Case]
  1. Edit /etc/lightdm/lightdm.conf and set [SeatDefaults] xserver-allow-tcp=true
  2. Start LightDM
  3. Attempt to connect to the X server using TCP

  Expected result:
  Able to connect

  Observed result:
  Unable to connect

  [Regression potential]
  Low. X.org changed their default behaviour from listen by default to listen if "-listen tcp" is passed as a command line flag. This is just the equivalent change in LightDM. Since this is a new flag to X.org if a user was to use another X server there is a risk it would not understand that flag. However it seems unlikely since X.org is the only actively developed X server.

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