Apple has recently released their latest OS for iPhone/iPad/iPod, the iOS 5.1. However I have difficulty in downloading the updates both from my Macbook or iPhone. It just hang without any response. I tried for a few days but I just can’t download the updates.
After some trial and error. I found out that actually the update software cannot find the update server’s host name. So to fix this problem, you just need to set you Mac/PC/iPhone’s DNS to an open/well know DNS so that the update software can find the exact location of the host name. I use Google’s open DNS and I can now download the updates without any issue.
Hope this information helps you too!