Nagios Support Forum

We've had Nagios Core running fine for a couple of years but now it's only showing localhost, even though all our hosts and services are still in the relevant cfg files.

All I did was change debug to 1 in /etc/nagios/nrpe.cfg, restarted nagios and ever since we've had this problem.
I changed it back to 0 but still the same problem.

I'm using version 4.3.4

I've seen now it was when I upgraded from 4.0.8 to 4.3.4, when I reverted back all the hosts have appeared again.

Why did it do that?

Did the nagios.cfg get re-installed and not have paths to your objects? It really depends on how it was installed and upgraded.