Unknown error -23 while downloading iOS 5

So I have been using the iPhone 4 for nearly a year and a half now with no issues whatsoever.
I wanted to update to the iOS 5 earlier today. When iTunes tried to download the OS, it failed with error -23, which is an unknown error. The rest of the message is a cryptic "there was a problem downloading the software for the iPhone <name>".
I went ahead and got the ipsw file for the GM release of iOS 5 anyway, and proceeded to install it using the "Restore" option (I kept Alt pressed on my keyboard and pointed iTunes to the ipsw file).
I now have iOS 5 on my phone and it works well. However, all my contacts have disappeared! iTunes has restored my music and my apps, but not my contacts. When I try to use the restore option and get my contacts back from an earlier back up, I experience the same error -23.
What worries me is that I haven't found a single relevant post on the web related to the specific error code "-23". I have no idea what the issue is and how I can correct it now.
Any help on this front will be greatly appreciated.
FYI,
iTunes: 10.5 (141)
Mac OSX: 10.6.8 (I gather that the latest version is 10.7.2, but I don't see this update in my software updates...is this an issue?).
I am from Singapore and I have a Singapore Apple ID. Please reach me if you want any more information.

Try this Link, it resolve my problems updating to IOS 5.
Download IPhone4 GSM
http://osxdaily.com/2011/10/12/ios-5-download-available/
http://www.nickpan.com/2011/10/15/iphone-ios5-upgrade-unknown-error-23/
P.S
I believe its ITunes bug, will be fixed in the upcoming ver of ITunes.

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