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After updating Nagios Core from 3.5.0 to 4.0.3, I receive the following message on many of the links on the left pane of the web portal. When I try to start the Nagios service, the interface say it started but if I check the status on it immediately afterwards, it says it's not running. So it appears that I need to know why the nagios service will not start. If I can get it to start, then maybe my web interface issues will go away. Can anyone assist? Please dumb it down as I'm very new to linux.
Whoops!
Error: Could not read host and service status information!
The most common cause of this error message (especially for new users), is the fact that Nagios is not actually running. If Nagios is indeed not running, this is a normal error message. It simply indicates that the CGIs could not obtain the current status of hosts and services that are being monitored. If you've just installed things, make sure you read the documentation on starting Nagios.
Some other things you should check in order to resolve this error include:
Check the Nagios log file for messages relating to startup or status data errors.
Always verify configuration options using the -v command-line option before starting or restarting Nagios!
Make sure you read the documentation on installing, configuring and running Nagios thoroughly before continuing. If all else fails, try sending a message to one of the mailing lists. More information can be found at http://www.nagios.org.
