I can connect to both wifi's, but one doesn't give me internet. The other doesn't allow me to detect other computers

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http://askubuntu.com – I want to connect to the internet on Wifi A. It shows the signal, but doesn't allow me on the internet. Most other people in the office can connect Wifi B is supplied by True Homewifi, which doesn't allow me to detect other computers, When I use nmap, I get only two IP addresses. When I access true, I get "Network Service Discovery disabled" and something about ".local" domain Do you have any ideas? (HowTos)