/etc/init.d script indicates it should be
stopped at one of the runlevels 0, 1, or 6 but not at all of them.
This is usually a mistake. Normally, facilities that need to be stopped
at any of those runlevels need to be stopped at all of them.
For example, if it is safe for the facility provided by this init script
to be stopped by
sendsigs at runlevels 0 and 6, there should be
no reason to special case runlevel 1, where
stop it. If the facility needs special shutdown handling when rebooting
the system (runlevel 6), it probably needs the same handling when
halting the system (runlevel 0) or switching to single-user mode