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

<desc>You can control which programs can access the network. This helps to keep your computer secure.</desc>
 </info>

<title>Enable or block firewall access</title>

<comment>
 <cite date="2012-02-19">shaunm</cite>
 Continue to revisit this page until we can provide real instructions. As
 it is, we're stuck in "whatever distros do" territory.
 </comment>
 <comment>
 <cite date="2013-11-03">Kat</cite>
 GNOME does not come with a firewall, this page needs to be revisited.
 </comment>

Your system should be equipped with a firewall that allows it to
 block programs from being accessed by other people on the internet or your
 network. This helps to keep your computer secure.

Many applications can use your network connection. For instance, you can
 share files or let someone view your desktop remotely when connected to a
 network. Depending on how your computer is set up, you may need to adjust the
 firewall to allow these services to work as intended.

Each program that provides network services uses a specific network
 port. To enable other computers on the network to access a service, you
 may need to “open” its assigned port on the firewall:

<steps>
 <item>
 Go to <gui>Activities</gui> in the top left corner of the screen and
 start your firewall application. You may need to install a firewall
 manager yourself if you can’t find one (for example, Firestarter or
 GUFW).
 </item>
 <item>
 Open or disable the port for your network service, depending on
 whether you want people to be able to access it or not. Which port you
 need to change will <link xref="net-firewall-ports">depend on the
 service</link>.
 </item>
 <item>
 Save or apply the changes, following any additional instructions given
 by the firewall tool.
 </item>
 </steps>

</page>