I'm still on 10.3.9. I need to have my parents over for dinner soon.
But, you should have a Systems Preferences folder, no? And some sort of Network area? But, I don't think that will come into play because I am pretty sure the firewall is off by default.
So, I think it is probably a router/moden problem. Your internet provider has probably given you some 'box' to help you connect to the internet. Can you look on it and find out the brand and model number? Then you just need to forward your ports through it.
I'm going to take off tomorrow for a couple of days, but if you have problems with this, PM me the link to this thread and I'll make sure to get back to you when I get home.
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