NSURLErrorDomain-1005 when trying to update software

I have twelve MacBooks all running OS X 10.4.11 in my classroom. I need to update them all. SU repeated gives me this:
"A networking error has occurred:
Error NSURLErrorDomain-1005 (-1005).
Make sure you can connect to the
Internet, then try again."
Well, I can connect to the Internet so that isn't the issue. Over lunch, I tried updating my flat panel iMac running 10.4.11 at home, and it worked perfectly. So far, two of the MacBooks have behaved this way. This is not a permissions issue (but yes, I've repaired permissions and checked the disk for failures...nothing turned up). I've deleted plist files and that didn't help. This is not a corrupted disk issue. I've scoured this forum and used Google to try to find an answer, but no one seems to have found a definitive fix for this. Is the only workaround installing the updates manually? That's going to be tough for twelve computers and classes beginning on Monday. Upgrading to Leopard is not an option.
Any suggestions that don't involve repairing permissions?

Joe Heafner wrote:
… does this mean that Software Update is officially fried on these machines from now on?
No. It is just that if you have a dubious connection it is better to do the download under your control and check it properly. There is still the same probability of the connection being dropped, but you can retry, perhaps at a less busy moment.
After manual download, be sure to verify the digest:
Mac OS X: How to Verify a SHA-1 Digest
Mac OS X: About SHA-1 Digest and Software Downloads
(This is done automatically when you use Software Update).

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