What TCP/UDP ports should be left open on a firewall? DSL FAQ

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If I am on the net 24hrs a day, will I get hacked?
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Where can I read more on Security
I have Norton Personall firewall or any other software firewall, am I safe?
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What type of security does a DSL line provide?
What TCP/UDP ports should be left open on a firewall?
Am I being watched by my ISP?
how do i make my pc pingable
What is a dummy DMZ?
Using Linux how can I make my computer safe?
Is there a difference between a IDS and a firewall?

What TCP/UDP ports should be left open on a firewall?

Where possible, no ports should be left open.
Open ports on an as-needed basis, perhaps for games, IRC, ICQ, streaming video, web server etc. If you have no idea why you should open a port, and have no problem to solved, then no ports need opening.

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by diaphanous

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What TCP/UDP ports should be left open on a firewall?