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<credit type="author">
 <name>Paul W. Frields</name>
 <email>stickster@gmail.com</email>
 </credit>

<desc>You need to specify the right network port to enable/disable network
 access for a program with your firewall.</desc>
 </info>

<title>Commonly-used network ports</title>

This is a list of network ports commonly used by applications that provide
 network services, like file sharing or remote desktop viewing. You can change
 your system’s firewall to <link xref="net-firewall-on-off">block or allow
 access</link> to these applications. There are thousands of ports in use, so
 this table isn’t complete.

<table shade="rows" frame="top">
 <thead>
 <tr>
	<td>
	 Port
	</td>
	<td>
	 Name
	</td>
	<td>
	 Description
	</td>
 </tr>
 </thead>
 <tbody>
 <tr>
	<td>
	 5353/udp
	</td>
	<td>
	 mDNS, Avahi
	</td>
	<td>
	 Allows systems to find each other, and describe which services
 they offer, without you having to specify the details manually.
	</td>
 </tr>
 <tr>
	<td>
	 631/udp
	</td>
	<td>
	 Printing
	</td>
	<td>
	 Allows you to send print jobs to a printer over the network.
	</td>
 </tr>
 <tr>
	<td>
	 631/tcp
	</td>
	<td>
	 Printing
	</td>
	<td>
	 Allows you to share your printer with other people over the
 network.
	</td>
 </tr>
 <tr>
	<td>
	 5298/tcp
	</td>
	<td>
	 Presence
	</td>
	<td>
	 Allows you to advertise your instant messaging status to other
 people on the network, such as “online” or “busy”.
	</td>
 </tr>
 <tr>
	<td>
	 5900/tcp
	</td>
	<td>
	 Remote desktop
	</td>
	<td>
	 Allows you to share your desktop so other people can view it or
 provide remote assistance.
	</td>
 </tr>
 <tr>
	<td>
	 3689/tcp
	</td>
	<td>
	 Music sharing (DAAP)
	</td>
	<td>
	 Allows you to share your music library with others on your
 network.
	</td>
 </tr>
 </tbody>
 </table>

</page>