xinetd[11497]: service/protocol combination not in /etc/services: nrpe/tcp

If you are in process of installing the NRPE daemon as an xinetd service for Nagios monitoring capabilities you may run across this error in /var/log/messages.

If you have started xinetd by typing the following:
shell# /etc/init.d/xinetd start

but you do not see the NRPE service listening by using netstat:
shell# netstat -an | grep 5666

then check /var/log/messages to see if an error similar to the following is in the log file:
xinetd[11497]: service/protocol combination not in /etc/services: nrpe/tcp

If so all you need to do is edit /etc/services and add the following line right above the cvsup entries.
nrpe 5666/tcp # NRPE

After this line is added restart xinetd and verify the 5666 port is now open. You should be good to go.

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