DBusException: org.freedesktop.DBus.Error.AccessDenied

[tomw]

Hi,

I'm running a program accessing disk parameters via UDisks. The
dbus-daemon I'm running on two machines is 1.4.0. On one machine (Ubuntu
10.4) I'm getting the following error message, on the other (10.10) it
works without  errors. 
The dbus configuration in system.d/org.freedesktop.UDisks.conf
on both is identical. 

DBusException: org.freedesktop.DBus.Error.AccessDenied: Rejected send
message, 3 matched rules; type="method_call", sender=":1.53" (uid=1001
pid=1759 comm="python) interface="(unset)" member="Get" error
name="(unset)" requested_reply=0 destination=":1.39" (uid=0 pid=1474
comm="/usr/lib/udisks/udisks-daemon))

Any idea?

many thanks