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That did it! The server in question is something of a sandbox for testing and someone one must tested a different Nagios install without letting anyone know.

Thank you so much for all your help.

If it isn't, then I'm getting an even weirder error - systemctl has been insisting all along Nagios is running. # ps -ef|grep bin/nagios nagios 11330 1 0 May17 ? 00:00:02 /usr/sbin/nagios -d /etc/nagios/nagios.cfg nagios 11331 11330 0 May17 ? 00:00:00 /usr/sbin/nagios --worker /var/spool/nagios/cmd/...

Here you go: [root@e108-dev puppet]# cat /etc/group|grep nag nagios:x:1002:apache nagcmd:x:1003: [root@e108-dev puppet]# ls -al /usr/local/nagios/var/rw total 0 drwxrwsr-x 2 nagios nagios 6 May 17 13:53 . drwxrwxr-x 5 nagios nagios 63 May 17 14:57 .. [root@e108-dev puppet]# ls -al /usr/local/nagios/...

Every page on the interface shows Nagios as being offline and unable to read from configuration data.

I installed a CLI interface and received a similar problem - although it would run, it listed no services or hosts.

I have recently installed Nagios 4.3.4 on a Centos7 server using the Installing Nagios From Source documentation at support.nagios.com. I had no difficulties with the installation and, after getting no serious errors on my script preflight check, went to localhost/nagios to ensure everything was wor...