Software Update can't download; Safari can't connect to apple (tough!)

hello -
I posted this topic in Safari but it may really be more of a networking question. I have two problems which are specific to one user account on my Tiger machine.
1) Safari can't connect to anything from Apple.com
2) Software Update can download lists of updates, but the downloads of the updates themselves never begin (hangs at 0 B of 31 MB, etc.)
Firefox is fine on apple sites from this account, and neither problem is present when I login to a different account.
Here are some things I've tried with no luck:
-trash com.apple.softwareupdate.plist
-move all plists out of Preferences and restart Safari
-move Safari folder out of ~/Library and restart Safari
-move everything out of ~/Library which is not present in
the working user account and restart Safari
-reinstall Safari from Tiger disc using Pacifist
I ran a port scan in Network Utility and this is what I get:
Port Scan has started ...
Port Scanning host: 192.168.100.54
Open TCP Port: 21 ftp
Open TCP Port: 22 ssh
Open TCP Port: 139 netbios-ssn
Open TCP Port: 427 svrloc
Open TCP Port: 445 microsoft-ds
Open TCP Port: 548 afpovertcp
Open TCP Port: 5900
Port Scan has completed ...
Is it weird that port 80 does not appear? Still, I get the same result from the working user's account so it's hard to imagine this is the case. I don't have the OS X firewall on.
I am really stumped by this problem and would love some help!
thanks,
Gene

curious and curiouser! Your suggestion to Reset Safari was a great one - thanks! Resetting Safari allows access to the apple websites again. There's no new software to download from SWUpdate right now, so I can't test that, but I will test as soon as I can.
here's the weird thing though. Attempting to login to these discussion forums using Safari brings the problem back again! I type in my login info and it hangs forever while trying to load discussions.apple.com/login.jspa. Once this has happened, then I'm once again unable to load anything under apple.com in Safari, until I Reset. I thought maybe this was a Java problem so I reinstalled the latest Java, but this doesn't help. Still no problem here in Firefox.
any thoughts!
Gene

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Software Update can't download; Safari can't connect to apple (tough!)

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