Caution

By default, Ubuntu ships with all its network ports blocked. That is, it does not listen to any requests on any ports when it is first installed. To configure the firewall, you must retrieve and install Firestarter using either synaptic or apt-get. After you have installed this, you can use it to configure the firewall to open specific ports relating to the topics covered in this chapter.

You can find detailed documentation about Firestarter at http://www.fs-security.com/docs/.

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