Have opened up BT Voyager utility and can find nothing that refers to UpNp or a firewall. Although BT recommended ZoneAlarm, would it be safe to turn this firewall off and restart the Windows firewall (I think Limewire suggested that this would configure automatically to accept Limewire)? Sorry but haven't a clue what a NAT firewall is....am not very technical but tried my best to work through the various recommendations in the Limewire site and then got stuck!