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File: //lib/firewalld/services/telnet.xml
<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>Telnet</short>
  <description>Telnet is a protocol for logging into remote machines. It is unencrypted, and provides little security from network snooping attacks. Enabling telnet is not recommended. You need the telnet-server package installed for this option to be useful.</description>
  <port port="23" protocol="tcp"/>
</service>