Unable to update iOS 5.1 on iPhone

I have tried update my iPhone 4S using both wifi and connected to my imac to no avail. I have tried different days and times and each time the update times out as it is trying to connect to the update server.

Are there any other details provided?  Possibly an error number?
What version of iTuns is installed on the computer?
PC or Mac?
What OS and version?

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