Comment 17 for bug 55828

Here I'm talking about TWO Fedora Core 5 recent, clean installs... Both of them up to dated; CUPS v.1.2.2; repos from Core, Extras and Livna, stable rpms (no testing). Gnome desktop, my choice.
Printer an HP 5150 deskjet, attached to my desktop PC, this is the printing server. I'd like to be able to print from my laptop via IPP. Both, desktop and laptop PCs conforms a LAN with assigned static IPs. Both of systems with its firewall configured (Firestarter GUI) widely permissive in order to be sure it's not interfering: allowing connections from respective hosts, opened 631 and 515 ports.
Printing server configured graphically through gnome applet, Sharing local printer, allowing connexions from any IP from the LAN, etc... (being a really generous setup).
Printing client configured via IPP pointing against the server IP/printers/name.of.the.queue
A similar scenario did work perfectly before, when both systems were with FC4 installed.
No doubts here: printer has no fault, neither hw nor configs, since it works perfectly from any direct connection.
Trying to print from the client (laptop) it only gives this message: