Printer share through CUPS hell... What could be wrong?

[Gain Paolo Mureddu]

    Yet again I face the hell of trying to share through CUPS a 
printer... I thought the issue with the firewall was solved in one of 
the various revisions of system-config-printer and printer-tui, but it 
seems I was wrong... In any case, I have made the printer atthached to 
my own computer available to all the hosts in the local network (I tried 
to specify the network to no avail). In anycase I turned down the 
firewall on my computer and the client computer could print to my local 
attached printer, exported as a CUPS (IPP) printer... So I opened the 
necesary ports on my firewall (I use a firewall builder generated 
firewall script) and in the policy I have set to accept all connections 
on the local network to my computer (for testing purposes set to log 
activity on this rule)... I bring up the firewall, and tail -f 
/var/log/messages... Then I try to print from the client computer... The 
connection is recieved and accepted on port 631, but no print 
activity... Hmmm... So remembered I also needed the spool ports... I 
went to firewall builder, but what do you know?? I am ACCEPTing all 
connections on the local network (Class C 192.168.1.0), and still no 
dice... In sytem-cofnig-printer (GUI) I see a message:

Unable to get printer status (client-error-forbidden)! What does that mean?

Also whenever I select on my computer Activate LPD protocol checkbox and 
accept that, if I immediately click the share properties again, the 
check box is diselected... So I assume the change does not have *any* 
effect and as such it is the same whatever I select as the CUPS printer 
in the client computer (another FC3 system)... Did I mention both 
systems are fully updated to today's (well yesterday's, actually) 
updates? I'm quickly running out of ideas as to what try next... I may 
try to use the system-config-printer-tui tool and see if with that I 
have any better luck... though I doubt it. And as I thought  a quick 
glance did not show anything to set sharing.