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I have a wireless router with WPA. I manage to connect to the network, but I have no connectivity to the Internet and when I ping the default gateway, I do not get a reply.

I also have access to an unsecured wireless router and when I connect to that, I have connectivity to the Internet.

Furthermore, when I connect from Windows 8 ( I have dual boot ) I have connectivity.

What is the problem and how can I fix it ?

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Check IP address on Ubuntu after connecting. ifconfig of ip addr in console or in network manager (dont know exactly where) –  week Nov 30 '12 at 8:54
    
The address and the default gateway are set. What do you mean by check ? –  coredump Nov 30 '12 at 13:45
    
Are you using DHCP? –  week Nov 30 '12 at 14:06
    
Yes. I am using DHCP. The configuration of ip, mask and default gateway is automatic. –  coredump Nov 30 '12 at 15:27
    
Let's start with some basics... What version of Ubuntu? What is listed in the file /etc/resolv.conf? –  Ian Atkin Nov 30 '12 at 16:34

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