I get "error during device I/O" on Xsane

I've connected my Epson Perfection V370 scanner to my server and I'm trying to use Xsane on my laptop with it. Xsane finds the scanner but has an "Error during device I/O" message. I get essentially the same error with Epson Scan 2. Simple Scan just says "Unable to connect to scanner." Both the server and the laptop are running Impish and I was able to scan with the scanner connected directly to the laptop's USB ports. Can anyone shed some light on the subject?