Hi melf,
try "lp0" (l-p-zero) instead of "lpt1".
That's the way how my hardware "print server" calls it. I also think that's the unixish way of calling these /dev/... (? not sure...)
I can't tell how these things work if the server is an eCS machine... I guess my server has some kind of embedded Linux running in it.
If that still doesn't get you anywhere, I can provide some screenshots and info about how I set up the ports/drivers on my eCS machine.
BTW:
I bought that box some years ago to be able to access USB printers over the network and save me from fiddling with USB print support. Works great.
(If anyone is thinking about "why would someone use such a box for?

)
Cheers, HTH,
Thomas