I have a Macbook Pro that runs on Leopard. I recently moved into a new apartment and share internet wirelessly with my neighbor. Things worked fine for a little but not i can connect to the network but not the internet. When I open wireless preferences it says "Airport has a self-assigned IP address and may not be able to connect to the internet." I called my neighbor and he said that he changed the security on the network from a WPA2-personal to a WPA-Personal. However, airport knows already lists it as a wpa personal network. Still not working. Any ideas?