LimeWire 5 location:
For
Windows: Tools > Options > Advanced > Listening Port.
___ Mac OSX: (
⌘ + ,) LW's Prefs > Advanced > Listening Port.
(Click to see larger image view)
If your router does not support Universal Plug 'n Play (UPnP), then you can manually port forward. You'll also need to forward the same port on your modem/router. Find your model on this list
PortForward.com - Free Help Setting up Your Router or Firewall. Listening Port & Manual Port Forward numbers should be the same!!!
Old LimeWire 5 location:
For
Windows: Tools > Options > Advanced > SuperReallyAdvanced > Firewall
___ Mac OSX: (
⌘ + ,) LW's Prefs > Advanced > SuperReallyAdvanced > Firewall
(Click to see larger view) LimeWire 4
Here's the LW 4 settings for Port Forwarding. If your router does not support Universal Plug 'n Play (UPnP), then you can manually port forward. You'll also need to forward a port on your modem/router. Find your model on this list
PortForward.com - Free Help Setting up Your Router or Firewall (NOTE!: This is now refered to as Manual Port Forward & NOT Force IP. A more appropriate name for the function!) Listening Port & Manual Port Forward numbers should be the same!!! See image below. (
Windows equivalent image click here)
For
Windows: Tools>Options>Advanced>Firewall
___ Mac OSX: (
⌘ + ,) LW's Prefs>Advanced>Firewall
___ (Mac OS 9 = windows location) 
.