I've installed nagios from the app center on a Slave Domain Controller, but it fails to start.
Manually trying to start the service gives the error:
"Starting the following services failed: nagios3"
The nagios3 log shows nothing significant:
 Nagios 3.4.1 starting... (PID=9743)
 Local time is Mon Mar 30 16:57:03 NZDT 2015
 LOG VERSION: 2.0
 Finished daemonizing... (New PID=9744)
 Caught SIGTERM, shutting down...
 Successfully shutdown... (PID=9744)
Where should I be looking next for possible causes?