Leave the firewall at Medium. If you set it to Maximum, every type of traffic will need to be explicitly allowed. This wont fit into most networks because a large portion of outbound traffic is a random high port.
^^^^ Thanks again Dream Killer, I also found out if you disable JAVA script in FireFox 15 (Ubuntu 12.04) you will not be able to login to the router , you will see 404 not found message. Sorry to ask so much but I have a new teenage neighbor that is very good with computers/networks and spends all his spare time in his room on the computer.
