How to resolve: "Update server not found (check your internet connection)"?

When doing Help / Check for Updates, I get "Update server not found (check your internet connection)". This has been the case for 6-8 weeks or longer but auto update worked fine before. Not sure if something changed on my MacBook Pro. If so, I can't pinpoint it.
MacBook Pro (Intel Core 2 Duo)
Mac OS 10.6.6
Firefox 3.6.13
Firefox set to "No Proxy"

See iOS: How to update your iPhone, iPad, or iPod touch
http://support.apple.com/kb/HT4623
If you are currently running an iOS lower than 5.0, connect to your computer & click on the "Update your device using iTunes".
Tip - Disable your firewall and anitvirus software temporarily.  Then download and install the iOS update. After you update to iOS 5.x, the next update can be installed via wifi (i.e., not connected to your computer).
 Cheers, Tom

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