<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">

  <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>[email protected]</email>
    </credit>

    <include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>

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

  <p>GNOME does not come with a firewall, so for support beyond this document
  check with your distribution’s support team or your organization’s IT department.
  Your computer 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, 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>