Did you just upgrade to iOS 6 (oh, vote on our poll here too about iOS 6)? Well no need to worry about that! There’s a relatively simple fix for your problem, and all you have to do is read on below…

1. Go to Settings ->Wi-Fi -> The Wi-Fi network you are currently connected to > tap on the blue circle arrow icon.
2. Scroll to bottom and set HTTP Proxy to “Auto“.

[Gizmodo]