Better give ourselves some control and open the music to the world. You will need both TCP and UDP ports at least initially. If you are concerned about security there is info in the SqueezeCenter forums that tell you precisely when each port is required.
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db configuration set squeezecenter service \
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status enabled \
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TCPPorts 9000,3483 \
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UDPPorts 9000,3483 \
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access private
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{{Note box|By default the above enables the service, opens the ports, and sets the access to private (ie. your LAN. If you wish to open this to the internet you change '''private''' to '''public'''.}}
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to change your install to public, either change private to public above or enter
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db configuration setprop squeezecenter access public
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{{Warning box|If you choose to make SqueezeCenter public then it is highly recommened that you configure SqueezeCenter to require a username and password. This can be done from SqueezeCenter's Settings->Advanced tab.}}