That is odd. Even when you directly connected the modem it still was a problem. There might be a firewall somewhere along the path that is causing the errors. It's possible that you can't accept incoming connections. You can check by looking in the Connections panel of LimeWire. Since ultrapeers are prevalent now it might take a long while to see an incoming connection (as opposed to outgoing) but if you have ever seen one then a firewall is not preventing incoming connections.