/usr/share/help/it/gnome-help/net-firewall-on-off.page is in gnome-user-docs-it 3.28.1-0ubuntu1.
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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" style="task" id="net-firewall-on-off" xml:lang="it">
<info>
<link type="guide" xref="net-security" group="#first"/>
<revision pkgversion="3.4.0" date="2012-02-20" status="final"/>
<revision pkgversion="3.10" date="2013-11-03" status="incomplete"/>
<revision pkgversion="3.18" date="2015-09-28" status="final"/>
<credit type="author">
<name>Paul W. Frields</name>
<email>stickster@gmail.com</email>
</credit>
<include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>
<desc>È possibile controllare quali programmi possono accedere alla rete. Questo aiuta a mantenere il computer sicuro.</desc>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Luca Ferretti</mal:name>
<mal:email>lferrett@gnome.org</mal:email>
<mal:years>2011, 2012</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Flavia Weisghizzi</mal:name>
<mal:email>flavia.weisghizzi@ubuntu.com</mal:email>
<mal:years>2011, 2012</mal:years>
</mal:credit>
</info>
<title>Abilitare o bloccare l'accesso al firewall</title>
<p>Your system should be equipped with a <em>firewall</em> 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.</p>
<p>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.</p>
<p>Each program that provides network services uses a specific <em>network
port</em>. To enable other computers on the network to access a service, you
may need to “open” its assigned port on the firewall:</p>
<steps>
<item>
<p>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).</p>
</item>
<item>
<p>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>.</p>
</item>
<item>
<p>Save or apply the changes, following any additional instructions given
by the firewall tool.</p>
</item>
</steps>
</page>
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