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Is your router using UPnP or port forwarding. I suspect the same port use is the issue. On the mac, try changing the listening port to another higher one between 49152 - 65535. Try port 64049. ie: go to LW's prefs, Advanced > FIrewalls & change listening port. Then reboot the mac if you've been using LW on the pc.

I don't know about UPnP on mac, but I do know if I've used a program using one port & try to use the same port for another app then it seems to refuse the connection. So I thus forward a port for each program & each LW. That seems the only way.

I tried changing the mac computer to a different port...but it still won't connect?

We need more information to help. And you didn't answer my other questions above either.

Sorry,

I am using port forwarding...

1. OS version? Tiger OS X 10.4.6
2. What firewalls you have? None...just on the router
3. How much ram? 1G DDR2
4. Hard Disk space available? 200GB
5. Connection type? Cable
6. Modem & router brand name & model numbers? Motorola SBG900
7. Where are you trying to connect from? House
8. What version of LimeWire (LW) & Java do you have? 4.12 / 1.5
9. Who is your ISP provider (Internet Service Provider)? Comcast
10. Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What happens when you go there? 'Your test worked!'
11. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up. Each computer connects via a wireless card to the router.
12. Is this a your 1st try at LW or is this a new problem with an experienced user. 1st try on this computer
13. Do you see a brick wall in front of the blue world icon at the bottom of LW's interface? Yes