Can't software update, networking error, yet internet connection fine

I am trying to use software update, but can't. I get this:
"A networking error has occured: timed out (-1001). Make sure you can connect to the internet, then try again. Software Update can't check for updates because of a network problem."
Yet network diagnostics show everything fine; mail works fine; network utility shows everything ok; wireless connection fine; TCP/IP looks normal; and browsers are fine -- here i am posting.
WTH?!
I know there are other threads about this, but the questions there are unanswered, even though the threads are marked answered.
I tried the following:
1. i backed up using Carbon Copy Cloner, then wiped my HD and copied back. That was ok, but still couldn't use software update.
2. i archived/installed 10.4, restarted.Some prefs gone but basically ok, couldn't use software update.
3. downloaded last combo update 10.4.7, and last security update. Quit everything, repaired perms, installed combo update, restarted. Installed security update, restarted.
4. i reset PRAM.
5. i checked the disk using Disk Utility. It's fine.
6. I made a new user account to test. Logged in there, tried software update, same result.
And i still can't use software update.
Someone in another thread wrote that this seems to be in UK and Netherlands. Possible?
Any suggestions anybody?
thanks, P
powerbook g4, 1ghz, 512 mb ram Mac OS X (10.4.7)

sorry, i forgot that: Yes, i deleted:
/Library/Preferences/com.apple.SoftwareUpdate.plist
[home]/Library/Preferences/com.apple.SoftwareUpdate.plist
[home]/Library/Preferences/ByHost/com.apple.SoftwareUpdate.plist
This last i am not sure of the exact name, i saw it before, deleted it, but it hasn't been regenerated.
there is also:
[home]/Library/Caches/Software Update/
which has nothing in it;
and
[home]/Library/Preferences/com.apple.SoftwareUpdate/
which has a lot of numbered folders and cache files with names like
'1321878279-2428557571.cache'
Should i try deleting those?
How do i find out the server name for Software Update btw?
Perhaps i should try plugging that into the SoftwareUpdate.plist?
thanks, P
powerbook g4, 1ghz, 512 mb ram Mac OS X (10.4.7)

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