The question is, can you access the global list server? If not, you probably need to adjust your firewall, and/or other security measures.

I used to have this problem because my internet was going through a IPX connection in a LAN.
First disable any firewalls or proxys that you may have running on YOUR computer.
Try it, If it dosent succeed then (this is what i did every time).
Dissconnect your Lan Cable from your ethernet card, wait 3 seconds and then reconnect it.
After 5 seconds or so on the top left corner it should say . Internet connection avalable . connect to server list. and UREKA they should all pop up.

I wouldent know the answer if you are running though a direct connection to the internet because i never had that problem before.