What's a good setting for my Firewall?

Running a Mac - do we need to buy into a internet security plan? And what are the differences in my Firewall settings? How dangerous is it to leave it on "allow all incoming connections"?

Catharsis wrote:
I guess I'll switch it to "allow only essential service" and see how "that behaves". Any suggestions, comments and advice will be greatly appreciated in regards to this setting.....
That setting is fine if you own just one computer and don't use a lot of network services.
I can't use that setting because I own several machines that I network, and use network services, like file sharing, chat, screen sharing, iTunes sharing, etc. so I can't have all those blocked.
I guess you'll have to see how it goes. If you don't run into any problems you can leave it on that setting.

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