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Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/7.4.30
System: Linux iZj6c1151k3ad370bosnmsZ 3.10.0-1160.76.1.el7.x86_64 #1 SMP Wed Aug 10 16:21:17 UTC 2022 x86_64
User: root (0)
PHP: 7.4.30
Disabled: NONE
$ pwd: /lib/firewalld/services/
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File: //lib/firewalld/services/xdmcp.xml
<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>XDMCP</short>
  <description>The X Display Manager Control Protocol (XDMCP) allows to remotely log in to an X desktop environment from any X Window System compatible client.</description>
  <port port="177" protocol="tcp"/>
  <port port="177" protocol="udp"/>
</service>
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