Nagios Support Forum

OK, tgriep, I think you nailed it.

I went step-by-step through the article until I got to the "Update Configuration" File section. More specifically, it was the "allowed_hosts=" line in the "/usr/local/nagios/etc/nrpe.cfg" file. I swear I've looked at this and added before but I was missing my actual server IP address. It even says, "
At this point NRPE will only listen to requests from itself (127.0.0.1). If you wanted your nagios server to be able to connect, add it's IP address after a comma (in this example it's 10.25.5.2): allowed_hosts=127.0.0.1,10.25.5.2."

So I added the server IP after the loopback, ran the test and it looks like it is working (assuming the test below looks correct).

local:/usr/local/nagios/libexec$ ./check_nrpe -H 10.192.3.173
I (0.5.2.35 2018-01-28) seem to be doing fine...

Glad it is working now. If you do not have any further questions, shall I close and lock the post for you?

If you don't mind, leave open just a bit longer. The command works on the client I was testing but not on another so I'm going to compare the nsclient.ini files to find the issue. It's likely my issue was on both ends.

OK, we'll leave it open.

OK, I think I'm set now.

These are the changes I made on the nsclient.ini file to get it working on the client side.

[/settings/external scripts]
allow nasty characters = false > changed to true
allow arguments = false > changed to true

[/settings/NRPE/server]
allow nasty characters = false > changed to true
allow arguments = false > changed to true
insecure = false > changed to true

Thanks again to everyone involved. Very much appreciate it.

Closing the thread as resolved.