Can't update iPhone 4 to ios 5.1

I can't update my iPhone 4 to IOS 5.1.  The message said that "There was a problem downloading the software for the iPhone 'iPhone".  The network connection could not be established.  I experienced this since 2 days ago until today.
I update the itunes, safari, imac OS X 10.6.8.
The firewall is not blocking any updates.
Anybody has the same problem?

Servers are still pretty busy.
I recommend searching google for an iOS 5.1 ipsw for your phone model, then restoring your device by holding down Option when clicking Restore, to select the 5.1 ipsw.

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