I have recently upgraded Cups (cupsys and cupsd, plus the foomatic* packages) and Firestarter to the current versions in Sarge; only to find that Cups is now behaving quite strangely.
A new printer can be installed, and a test page printed. However, from here on neither root nor any user can print to that printer (error: "client-error-not-possible"). Connections to the ip address of the printer are set to 'allow' in Firestarter, and no unexpected hits are seen in the logs.
One possible clue is that while the printers are all listed correctly by KDEPrint, on attempting to restart the Cups server the error "Error: Connection refused." Restarting Cups via /etc/init.d/cupsys restart works fine however.
Overal setup is: Sarge, 2.4.27-1-686 kernel, HP4200N printer (however same problem with other HP printers on the network).
Any thoughts ?