CUPS: Problem sharing USB-Printer

[Roger Grosswiler <roger gwch net>]

I have a PSC750, which is installed locally on a server - ready to
share. I can print locally on the server, but i cannot connet from a
client to this printer. 

Cups replies, that i am not authorized. But i checked, everybody should
be authorized. 

Is there a bug in Cups using USB-Printers? Perhaps a Problem with the
device-URI?

Thanks,
Roger