/usr/lib/firewalld/services/ Current File: //usr/lib/firewalld/services/nrpe.xml

<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>NRPE</short>
  <description>NRPE allows you to execute Nagios plugins on a remote host in as transparent a manner as possible.</description>
  <port protocol="tcp" port="5666"/>
</service>