Thanks for the file. The most obvious potential issue there checks out.
What's the output of history | grep nrpe
? It may be nothing, but it's worth a look.
Also, you never answered my question about Section V. CHECK_NRPE: Received 0 Bytes From Daemon. Check The Remote Server Logs For Error Messages, starting on page 6 of https://assets.nagios.com/downloads/nag ... utions.pdf
. We need to know if you went through that, so we aren't just copying the same commands from that into the forum.