From Messages file: This is when i restarted Nagios then at midnight is when monitoring stopped! Nov 6 07:01:30 wc-nagios nagios: livestatus: Livestatus 1.2.2p3 by Mathias Kettner. Socket: '/var/spool/nagios/cmd/live' Nov 6 07:01:30 wc-nagios nagios: livestatus: Please visit us at http://mathias-kettner.de/ Nov 6 07:01:30 wc-nagios nagios: livestatus: Hint: please try out OMD - the Open Monitoring Distribution Nov 6 07:01:30 wc-nagios nagios: livestatus: Please visit OMD at http://omdistro.org Nov 6 07:01:30 wc-nagios nagios: livestatus: Removed old left over socket file /var/spool/nagios/cmd/live Nov 6 07:01:30 wc-nagios nagios: livestatus: Warning: environment_macros are enabled. This might decrease the overall nagios performance Nov 6 07:01:30 wc-nagios nagios: livestatus: archive path /var/log/nagios/archives Nov 6 07:01:38 wc-nagios nagios: livestatus: Finished initialization. Further log messages go to /var/log/nagios/livestatus.log Nov 6 07:01:38 wc-nagios nagios: Event broker module '/usr/lib/check_mk/livestatus.o' initialized successfully. Nov 6 07:01:38 wc-nagios nagios: livestatus: Livestatus 1.2.2p3 by Mathias Kettner. Socket: '/var/spool/nagios/cmd/live' Nov 6 07:01:38 wc-nagios nagios: livestatus: Please visit us at http://mathias-kettner.de/ Nov 6 07:01:38 wc-nagios nagios: livestatus: Hint: please try out OMD - the Open Monitoring Distribution Nov 6 07:01:38 wc-nagios nagios: livestatus: Please visit OMD at http://omdistro.org Nov 6 07:01:38 wc-nagios nagios: livestatus: Removed old left over socket file /var/spool/nagios/cmd/live Nov 6 07:01:38 wc-nagios nagios: livestatus: Warning: environment_macros are enabled. This might decrease the overall nagios performance Nov 6 07:01:38 wc-nagios nagios: livestatus: archive path /var/log/nagios/archives Nov 6 07:01:38 wc-nagios nagios: livestatus: Finished initialization. Further log messages go to /var/log/nagios/livestatus.log Nov 6 07:01:38 wc-nagios nagios: Event broker module '/usr/local/lib/mk-livestatus/livestatus.o' initialized successfully. Nov 6 07:01:38 wc-nagios nagios: Finished daemonizing... (New PID=26451) Nov 6 07:01:38 wc-nagios nagios: livestatus: Cannot delete non-existing downtime/comment 16921 Nov 6 07:01:38 wc-nagios nagios: livestatus: Cannot delete non-existing downtime/comment 16922 Nov 6 07:01:38 wc-nagios nagios: livestatus: Cannot delete non-existing downtime/comment 16923 Nov 6 07:01:38 wc-nagios nagios: TIMEPERIOD TRANSITION: 24X7;-1;1 Nov 6 07:01:38 wc-nagios nagios: TIMEPERIOD TRANSITION: 24x7;-1;1 Nov 6 07:01:38 wc-nagios nagios: TIMEPERIOD TRANSITION: 24x7_sans_holidays;-1;1 Nov 6 07:01:38 wc-nagios nagios: TIMEPERIOD TRANSITION: anka-schedule;-1;1 Nov 6 07:01:38 wc-nagios nagios: TIMEPERIOD TRANSITION: clinicalhours;-1;0 Nov 6 07:01:38 wc-nagios nagios: TIMEPERIOD TRANSITION: daily_6-7am_reboot;-1;0 Nov 6 07:01:38 wc-nagios nagios: TIMEPERIOD TRANSITION: integrihours;-1;0 Nov 6 07:01:38 wc-nagios nagios: TIMEPERIOD TRANSITION: none;-1;0 Nov 6 07:01:38 wc-nagios nagios: TIMEPERIOD TRANSITION: us-holidays;-1;0 Nov 6 07:01:38 wc-nagios nagios: TIMEPERIOD TRANSITION: workhours;-1;0 Nov 7 00:00:00 wc-nagios nagios: Caught SIGSEGV, shutting down... Same information in log at: /var/log/nagios/nagios.log Working fine then the "Caught SIGSEGV, shutting down..." message then next was me restarting in the morning