OSX is blocking ports with firewall turned off...

I just purchased an iMac last week. I am not new to macs, but this is my first one in a few years so I am new to Leopard. The problem I've been having is strange. It seems that port 5190 is totally unreachable. This makes it impossible to connect to aim and use file transfer. I know i can connect on port 443, but file transfer doesn't work on that port. I also can not connect to certain streaming video websites. Justin.tv is one of them. On that site, the page loads perfectly, but no video loads. Other ports could also be affected but as of now, 5190 is the only one I know for a fact not to be working. I am behind a router, but I have 5 other PCs using the router with no problems. Everything works great on the windows machines. I have also tried to directly connect the mac to my cable modem. That didn't work. The blockage is local to this machine. I have disabled the OSX firewall and that did nothing. I am at a total loss here. If there is anyone that has an idea, i would very much appreciate it.
thanks

Just to make sure, by disabled the firewall, you've set it to Allow all incoming connections?
Can you Ping it on that port? You may need to make sure Stealth mode is turned off in the Advanced button of Firewall System Prefs. While there, enable logging. Try to connect and see what the log produces.

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