Updating iPad 2

Hi I have the iPad 2 and it is telling me I need to update yet when I try to do this it gives me an error message that says

 

"iOS 6.1 failed to verify because you are no longer connected to the Internet" now I have also tried to update by connecting to my iMac but it tells me I am having network connection errors.

 

Anyone got any solutions?

 

Thanks

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