[CUPS] and... non existent printer

[BeteNoire]

I have a strange problem with my printer.
Few weeks ago I was able to print on network shared printer, but now it is impossible, because printer seems not to... exist.
Symptoms:
[code]Samsung2010 at AUVI (Default printer) "/usr/libexec/cups/backend/ipp failed"
Samsung2010 at AUVI (Default printer) "/usr/libexec/cups/backend/http failed"[/code]
on the http://localhost:631/printers/ page.

[code]E [28/May/2007:18:28:44 +0200] [Job 881] Destination printer does not exist!
E [28/May/2007:18:28:44 +0200] PID 6815 (/usr/libexec/cups/backend/ipp) stopped with status 4![/code]
in /var/cups/error_log.

I've added this printer using CUPS page form, and I've made, what CUPS help page says:
[code]CUPS_DEBUG_LEVEL=2 /usr/libexec/cups/backend/snmp auvi
INFO: Using default SNMP Community public
DEBUG: Scanning for devices in "public" via "auvi"...
DEBUG: 0.001 Sending 46 bytes to 10.0.0.3...
DEBUG: SEQUENCE 44 bytes
DEBUG:     INTEGER 1 bytes 0
DEBUG:     OCTET STRING 6 bytes "public"
DEBUG:     Get-Request-PDU 31 bytes
DEBUG:         INTEGER 4 bytes 1180373800
DEBUG:         INTEGER 1 bytes 0
DEBUG:         INTEGER 1 bytes 0
DEBUG:         SEQUENCE 17 bytes
DEBUG:             SEQUENCE 15 bytes
DEBUG:                 OID 11 bytes .1.3.6.1.2.1.25.3.2.1.2.1
DEBUG:                 NULL VALUE 0 bytes
DEBUG: 1.004 Scan complete![/code]
printers.conf file of local machine
[code]</Printer>
<DefaultPrinter Samsung2010 at AUVI>
Info Samsung ML-2010 P na AUVI
Location http://auvi:631/
DeviceURI ipp://auvi:631/ipp/
State Stopped
StateMessage /usr/libexec/cups/backend/ipp failed
StateTime 1180369724
Accepting Yes
Shared Yes
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
AllowUser dexter
OpPolicy default
ErrorPolicy stop-printer
</Printer>[/code]

And [url=http://avchelm.neostrada.pl/linux/gentoo/konf/auvi/cupsd.conf.txt]cupsd.conf[/url] of print server machine. I am using 1.2.11 version of CUPS.

What the... ? :?