IOS 5.1 won't update on my wifi but will on another network

I have tried updating to iOS 5.1 on my ipad 2 and iphone 4s both OTA and via iMac but keep getting software update failed. I then completed an OTA update with my iPhone 4s using my brothers wifi??
can anyone explain why my update will not start on my own wifi?
I use sky broadband netgear router. I have tried restarting the router but it makes no difference, all other internet connections via this wifi are working fine
thanks
chris

It would seem that certain DNS addresses are having trouble connecting to the apple servers - including Sky's. People seem to get round this by changing their DNS address to opendns or google. The catch is that you can't change a sky router's dns address, so you will need to change it on your computer.
Check out this webpage on how to configure your DNS address on your computer
http://code.google.com/speed/public-dns/docs/using.html

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Resolution
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