I have problem with printers (Ricoh Aficio MP C2800) status monitoring with plugin check_printer after Debian 5 -> 6 upgrade.
./check_printer 192.168.1.8 public alerts
UNKNOWN - Internal error
but toners monitoring is fine:
./check_printer 192.168.1.8 public toner 1
OK - Černý toner
HP printers are fine even with status monitoring…