Le 21/04/2017 à 18:44, m.roth@5-cent.us a écrit :
Firewall open on the port... no, you said it sends some signal, since it prints out a blank page. And CUPS on your box is configured to understand the printer, right?
[Much later.]
I just spent a few unnerving hours, and I found the solution.
The printer was working all along, as it seems. The only thing that's buggy is the "Print Test Page" button in HP-Toolbox, which produces a blank page. All other stuff like PDF documents works fine.
Cheers,
Niki