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<?xml version="1.0" encoding="utf-8"?>
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<page xmlns="http://projectmallard.org/1.0/" type="topic" style="task" id="net-firewall-on-off" xml:lang="el">
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<link type="guide" xref="net-security"/>
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<desc>You can control which programs can access the network. This helps to keep your computer secure.</desc>
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<revision pkgversion="3.4.0" date="2012-02-20" status="final"/>
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<name>Paul W. Frields</name>
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<email>stickster@gmail.com</email>
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<include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>
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<title>Enable or block firewall access</title>
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<cite date="2012-02-19">shaunm</cite>
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<p>Continue to revisit this page until we can provide real instructions.
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As it is, we're stuck in "whatever distros do" territory.</p>
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<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>
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<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>
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<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>
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<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>
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<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>
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<p>Save or apply the changes, following any additional instructions given by the firewall tool.</p>
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gnome-help/el/net-firewall-on-off.page
