** Changed in: lightdm (Ubuntu Precise)
Assignee: Robert Ancell (robert-ancell) => (unassigned)
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Touch seeded packages, which is subscribed to lightdm in Ubuntu.
XDMCP server starts without authentication if configured key does not
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 1.16 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:
An incorrectly configured XDMCP server will start without authentication
instead of disabling XDMCP / stopping LightDM.
1. Set up LightDM to run an XDMCP server using an XDM authentication key,
i.e. in lightdm.conf:
2. Do not create /etc/lightdm/keys.conf or do not define 'key-name' in
3. Start LightDM
4. Connect XDMCP client.
Either LightDM doesn't start or the XDMCP server doesn't start.
XDMCP server starts without authentication, any XDMCP client is able to
connect. Debug message printed to log warning about missing key, but not easy
Low - change is to not start LightDM if this case occurs. This could affect
someone who currently has a misconfigured LightDM. In this case a warning
message is printed to the log.
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