Linux vacca.o2switch.net 4.18.0-553.123.2.lve.el8.x86_64 #1 SMP Thu May 7 23:17:13 UTC 2026 x86_64

//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>