Not sure how difficult this would be, but why not emulate the "good old
TTY days" and send a broadcast message to all TCs, something like
"Message: Server is going down NOW!", followed by a forced logout to LDM
prompt.. ? Since LDM, according to Roland anyway, can survive a server
reboot, kicking the clients back to a login prompt would be a good
thing, to avoid having to reboot, say, a hundred thin-clients.

Another idea, maybe a hook on the server to warn the admin: "WARNING: XX
number of client sessions are active - continue?"...Oh, oh, and what
about some "shutdown" style options, maybe "Halt/reboot in X
seconds/minutes"... shouldn't be difficult since the functionality
already exists in the shutdown command, and LTSP setups really do sort
of emulate the days in which this functionality was useful...

-- 
rebooting ltsp server leaves client stuck
https://bugs.launchpad.net/bugs/107526
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