Unable to connect to Apple update server

Curiosity

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I am no longer able to make any connection to the Apple update server. The diagnostic tells me that there is nothing wrong with the internet connection. I am able to web browse, download with Cocoa Wget, load email and load newsgroups. How do I fix this?
Do I have to allow any remote sharing to get updates? What firewall settings need to be changed?
Does this situation mean that something is seriously wrong with the operating system, and I need to reinstall it? Perhaps I just need to restore a system preference library file (I have a backup of those), and if so, which one?
 
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