** 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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https://bugs.launchpad.net/lightdm/+bug/1575200/+subscriptions
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