Software update doesn't recognise internet

Since my computer last updated (some time in July), software update has stopped working.
For example, itunes is repeatedly informing me of a new update, but then software update, after trying to check for new software comes up with an error message stating there appears to be no internet connection and directing me to network diagnostics which says everything is fine, at which point software update quits.
This error occurs on both home and work internet connections (regardless therefore of proxy settings) and everything worked fine until July.
Is it possible to get an older version of software update back somehow using time machine? Or do I have to redownload via the mac website the latest version of Snow Leopard to try and fix this.
I am the only user on this computer and am administrator.

It is not my ISP-it does not work on both a university network, a cable service provider and a normal home internet connection-i.e. in every possible type of network I connect to. I have not changed my internet configuration or anything-it simply stopped working after my last major OS update (must have been quite large as it took about 20 minutes for my old computer to install it on restart).
Pinging swcdn works fine.
Pinging swquery and swscan does not work. I guess this must be the problem.
I can download files from the apple website fine. Its just a bit annoying to have to remember to go to the website.

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