Bug#890517: killer's CRON logs out users once per hour
> IIRC, for connections to a system that runs Nomachine technology (not
> part of Debian) the utmp/wtmp files are not used by design (on the
> system running NX server). Instead, NX keeps track of the forwarded
> sessions itself.
Updating utmp/wtmp is not only for 'keeping track of sessions', it is
also used by shutdown and other systems to know who to notify when
taking down a host or notify logged in users in other cases. If NX do
not update utmp/wtmp for logged in users, I would claim that NX is
broken, and if it is by design, then NX is broken by design.