If the exception was made properly, should not be any problem. You can edit the firewall rule. From memory, (without rebooting my old computer) you can set port ranges. Simply put a wider range of port ranges. Example, port 1000-65535 instead of a specific port. Keep in mind the exception is only for limewire. In this way, it caters for a router that uses UPnP & changes listening port each time LW is opened. I cannot remember whether Tiger OSX 10.4 asks for a port number(s) or not off-hand. I know Panther OSX 10.3 did. No need to specify ports with Leopard 10.5