In the future, please create a new thread and link to the old one instead of adding on.
Unfortunately no follow up on this post. I've got the same problem after updating a macOS server to Sierra. However, I also have a working macOS Sierra server. So it seems some local issue. Nagios is saying:
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CHECK_NRPE: Received 0 bytes from daemon. Check the remote server logs for error messages.
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/usr/local/nagios/libexec/check_nrpe -H XX.XX.X.XX -n
Connection refused by host
I've also checked to see if NRPE is running on the mac server, but I couldn't find any processes with that name. But again, I could also not find it on any other Mac servers which work just fine. Is this a constantly running process or is this only running when triggered by the Nagios server?
I do have an old version of Nagios (Nagios Core 3.4.3).
Hope you can help.