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

//usr/lib/firewalld/services/klogin.xml

 <?xml version="1.0" encoding="utf-8"?>
<service>
  <short>klogin</short>
  <description>The kerberized rlogin server accepts BSD-style rlogin sessions, but uses Kerberos 5 authentication.</description>
  <port port="543" protocol="tcp"/>
</service>