Hi I navigated to this forum thanks to this thread:
/hp-ux/140594-couldnt-start-nrpe-services-unknown-service.html
I don't know why is closed without a solution.
Whatever...
Feb 22 17:00:43 localhost daemon:err|error inetd[3408006]: nrpe/tcp: unknown service
Means, you need to add something like this:
nrpe 5666/tcp
on /etc/services