** Changed in: lightdm (Ubuntu Wily)
Assignee: Robert Ancell (robert-ancell) => (unassigned)
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Connect to XDMCP clients on address requests come from if available
Status in Light Display Manager:
Status in Light Display Manager 1.10 series:
Status in Light Display Manager 1.14 series:
Status in Light Display Manager 1.2 series:
Status in lightdm package in Ubuntu:
Status in lightdm source package in Precise:
Status in lightdm source package in Trusty:
Status in lightdm source package in Vivid:
Status in lightdm source package in Wily:
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.
1. Start LightDM with XDMCP enabled
2. Connect with a client that puts a number of addresses in the Request packet
LightDM prefers the address the Request came from over the other addresses.
LightDM always picks the first address.
There is a possibility of a behaviour change in existing clients that had two
valid addresses, though the particular address shouldn't matter (unless complex
firewalling / routing rules are being used). There is a risk that XDMCP
behaviour could have been broken by the change (tested with regression tests).
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