Maybe there's a problem with DNS resolution. Try this:
Code:
su
mcedit /etc/resolv.conf
Add the following line:
Code:
nameserver 217.115.138.24
Press F2 to save changes, F10 to quit.

More public name servers: http://www.opennic.unrated.net/public_servers.html

Test new settings with
Code:
nslookup www.google.com 217.115.138.24