Unable to connect to app store after upgrading to ios5.1??

Have tried everything restoring, resetting, formatting!!! Rest all network related apps like safari and fb are doing fine.Only the featured page is opening in app store.top 25 n search are not!! I can connect using mobile data connections but am unable to open anything through wifi... feel like kicking myself for upgrading to ios5.1.

Thx very much....but I could open the website and the itunes store....
After I tried typing following orders in Commonds, the problem solved:
rm ~/library/preferences/com.apple.appstore.plist
rm ~/library/preferences/com.apple.storeagent.plist
rm -rf ~/library/preferences/byhost/*
hope can hlep others

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here is a "copied" version with credits for those looking for a solution to an annoying problem Apple should patch. (Yes, I'm aware of the irony of that statement)
July 18, 2012 · by Arthur Lockman · in Apple, Tutorials
After doing a reinstall of Lion a few weeks ago, I found that my computer suddenly would reject every VeriSign certificate that it encountered. Using Chrome, that meant that I couldn’t even access Twitter.com, because it thought that the certificate was wrong. I couldn’t login to the Apple developer portal, I couldn’t authenticate a device with XCode, I couldn’t make a purchase at Apple.com, I couldn’t download updates from the Mac App Store, and I couldn’t login to Mint.com, among other sites. I essentially couldn’t do anything that used a VeriSign certificate for SSL.
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