Certain websites not opening in 12.04

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http://askubuntu.com – I have just installed Ubuntu 12.04 as a dual boot. I have an issue accessing certain websites such as google but no such problem in windows. What could be the problem? The same issue exists in all browsers that i tried (Firefox, Chrome, Chromium) Please advice I have a DSL connection which i configured using the Network Manager. (HowTos)