I am pretty new with this software and have been reading up about it as much as i can. Recently I have been given more responsibility within my company and our nagios software went out. I've dug around through the config.d/ folder structure, command.cfg and nagios.cfg without any luck. Everything looks or appears to be normal? The service is running but the nagios website doesn't show any hosts at all..this randomly stopped about 3 weeks ago. We have a ton of hosts added to Nagios Core so they do exist but Nagios isn't seeing anything.
I've restarted nagios4.service a few times without any luck.
Nagios4
Apache2
Could I get some steps for troubleshooting this?
Thanks!
Heres pictures on what I am referring to: