cupsd malfunctions when addressed via zeroconf

[AprilHare]

Binary package hint: cups

cupsd refuses access via zeroconf.
Computer name testcomp; trying to access server using URL http://testcomp.local:631/ via firefox at test computer or other computer on LAN gives error
400 Bad Request
This also applies when attempting to access printer queue from another computer.
Other services works OK via zeroconf, e.g. ssh, as does http://localhost:631/

ProblemType: Bug
Architecture: amd64
Date: Fri Oct 16 14:40:55 2009
DistroRelease: Ubuntu 9.10
Lpstat:
 device for HP_LaserJet_1020: hp:/usb/HP_LaserJet_1020?serial=JL2TWEV
 device for MP170: usb://Canon/MP170
MachineType: Gigabyte Technology Co., Ltd. P35-DS3L
NonfreeKernelModules: nvidia
Package: cups 1.4.1-5ubuntu2
Papersize: a4
PpdFiles:
 HP_LaserJet_1020: HP LaserJet 1020 Foomatic/foo2zjs (recommended)
 MP170: Canon PIXMA MP170 - CUPS+Gutenprint v5.2.4
ProcCmdLine: root=UUID=5b8180ab-bfa5-4e3f-a91e-4134963e8df3 ro quiet splash
ProcEnviron:
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-13.44-generic
SourcePackage: cups
Uname: Linux 2.6.31-13-generic x86_64
XsessionErrors:
 (gnome-settings-daemon:3791): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (polkit-gnome-authentication-agent-1:3913): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (nautilus:3883): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (Do:3920): Wnck-CRITICAL **: wnck_set_client_type got called multiple times.
 (gnome-panel:3882): Gdk-WARNING **: /build/buildd/gtk+2.0-2.18.2/gdk/x11/gdkdrawable-x11.c:952 drawable is not a pixmap or window
dmi.bios.date: 11/10/2008
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F9C
dmi.board.name: P35-DS3L
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF9C:bd11/10/2008:svnGigabyteTechnologyCo.,Ltd.:pnP35-DS3L:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP35-DS3L:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: P35-DS3L
dmi.sys.vendor: Gigabyte Technology Co., Ltd.