New data point:
Success! That is, I tried connecting to Calibre on a different PC on the home network. And on this one, it worked like a charm. No problem at all. We can see the whole book list from the iTouch, and a trial download was a cinch.
So what's different? The configurations on both machines are identical, to the best of my knowledge, except for two things:
Sagittarius, which did not work, is a laptop with a wireless connection to the network. It is also XP Pro.
Orion, which did work, is a desktop with an ethernet connection to the network, and it runs XP Home.
Other than that, any differences are entirely accidental. Same antivirus, same firewall, same Calibre config.
I don't know if that helps in the debugging effort, but at least it has things working in our home.
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