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[Launchpad Bug Tracker <1481561@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lightdm - 1.15.1-0ubuntu1

---------------
lightdm (1.15.1-0ubuntu1) wily; urgency=medium

  * New upstream release:
    - Fix default X server command set to XMir in 1.15.0.
    - Internally merge the [SeatDefaults] and [Seat:*] sections together. The
      previous method meant configuration snippets using a mix of old and new
      naming would not correctly override eachother.
    - Use IP address of XDMCP requests to contact X server if available.
      (LP: #1481561)
    - Add an option for XDMCP and VNC servers to only listen on one address.
      (LP: #1390808)
    - Fix configuration file warnings so they go to the log, not stderr.
    - Warn if deprecated options logind-load-seats or xdg-seat are in
      configuration. (LP: #1468057)
    - Improve IP addresses in XDMCP log messages.
    - Fix typo in dm-tool man page. (LP: #1470587)

 -- Robert Ancell <robert.ancell@xxxxxxxxxxxxx>  Wed, 05 Aug 2015
16:53:39 +1200

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

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https://bugs.launchpad.net/bugs/1481561

Title:
  Connect to XDMCP clients on address requests come from if available

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 Committed
Status in Light Display Manager 1.2 series:
  Fix Committed
Status in lightdm package in Ubuntu:
  Fix Released

Bug description:
  Currently LightDM connects to an XDMCP enabled X server using the
  first suitable address in the XDMCP Request packet. However, some
  clients may put a number of addresses in this message and potentially
  they are not all routable. If the address the request message came
  from is in the list we should use that first as that is more likely to
  be a routable address. This also matches the behaviour of GDM which
  ignores the contents of the Request packet anyway.

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