[LightDM] Error connecting to X server via IPv6
patrick.monnerat at dh.com
Fri Apr 8 11:58:16 UTC 2016
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
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
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
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