Why can my macbook only access the internet from certain wireless sources?

I have tried connecting to the internet at my friends houses with my macbook but even though I can join the network, the internet itself doesn't work. Is there a reason for this? I've even tried to connect to the internet through a wireless network that my friend was accessing with no problem, from his macbook.

Possible reasons for being unable to connect to a strange network:
- Wrong proxy information
- Wrong network password
- Your friends router has "MAC address filtering" turned on.
You might find you can connect by creating a new location like this:
System Preferences > Network
Select the AirPort from the left hand side
Click on the Locations combo box and select Edit Locations...
Click on + to add a new location, give it a memorable name
Select the AirPort tab and enter your network name
Select TCP/IP tab. 
Configure IPv4 Using DHCP
Now click on Renew DHCP Lease.  After a few seconds you should get an IP address (probably 192.168.x.x)
Click on Proxies tab.
Select Auto Proxy Discovery and Use Passive FTP
Click on OK and Apply, etc.

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