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I could be completely wrong on this, but I think that all your ports are open by default unless you are running a firewall such as firestarter. If you are running firestarter, then you need to create a service for aMule.
Make sure that if you are using a router or modem with NAT/SPI firewall routing, that the ports are opened there. Otherwise, you may find that the network is just being slow
Probeer de router in je netwerk terug te zetten met de default instellingen en zet daarna WPA erop?