1. Mac OS X Tiger
2. Built in fire-wall, but it's off.
3. How much ram? I'm not sure.
4. Hard Disk space available? I'm also not sure.
5. I'm connected through a router, so cable?
6. Modem & router brand name & model numbers?
7. Where are you trying to connect from... house.
8. LW version - 4.14.12 Java-1.5.0_07
9. ISP, Bell.
10. I see the words, "Your test worked!".
11. I'm sharing the connection with 2 other computers.
12. I just switched to a Mac and it won't connect. If was working on my windows.
13. I do see a brick wall.
14. UPnP is available.
15. The built in firewall on my Mac, isn't on.
16. I live in Canada.

I hope that helps.

I'll also try what you said.