group.of.nepali.translators team mailing list archive

[Robert Ancell <robert.ancell@xxxxxxxxxxxxx>]

** Changed in: lightdm/1.18
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1575200

Title:
  Error connecting to X server via IPv6

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.10 series:
  Fix Committed
Status in Light Display Manager 1.16 series:
  Fix Committed
Status in Light Display Manager 1.18 series:
  Fix Released
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Trusty:
  Fix Committed
Status in lightdm source package in Wily:
  Fix Committed
Status in lightdm source package in Xenial:
  Fix Committed

Bug description:
  I've discovered a problem in lightdm XDMCP using link-local IPv6 addresses without interface index to connect to X server.
  It has been originally reported at https://bugzilla.redhat.com/show_bug.cgi?id=1322775.

  The problem can be fixed by having the XDMCP client not transmitting
  link-local addresses in the request, but if it does, lightdm XDMCP
  server can be a lot smarter if the attached patch is applied.

  It changes the X server address selection order to set the lowest
  preference to link-local addresses, even if matching the source
  address or family.

  This is not 100% full-proof: if only link-local addresses have been
  received, one of them is used anyway. In this case, a complete
  solution would be to determine and set the address interface index if
  not ambiguous.

  However, this patch fixes the problem for most of the non-pathological 
  cases.

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