A bug in Nagios core 3.3.1 to prevent you from schedule host/service downtime

edit /etc/init.d/nagios, jum to the start) fragment :

add chown $NagiosUser:$NagiosGroup $NagiosCommandFile

after

if [ -d $NagiosLockDir ]; then touch $NagiosLockDir/$NagiosLockFile; fi
echo " done."