Description of problem:
start s-c-services like a nonroot a u will see traceback

Version-Release number of selected component (if applicable):
system-config-services-0.99.28-1.fc10.noarch

How reproducible:
always

Steps to Reproduce:
1. su some_user
2. system-config-services
  
Actual results:
[petr@localhost ~]$ system-config-services 
ERROR:dbus.proxies:Introspect error on :1.64:/org/fedoraproject/Config/Services/ServiceHerders/SysVServiceHerder: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.AccessDenied: A security policy in place prevents this sender from sending this message to this recipient, see message bus configuration file (rejected message had interface "org.freedesktop.DBus.Introspectable" member "Introspect" error name "(unset)" destination ":1.64")
Traceback (most recent call last):
  File "/usr/bin/system-config-services", line 945, in <module>
    GUI (use_dbus = use_dbus).run ()
  File "/usr/bin/system-config-services", line 900, in __init__
    self.serviceherders.append (cls (bus = self._bus))
  File "/usr/lib/python2.5/site-packages/scservices/dbus/proxy/serviceherders.py", line 53, in __init__
    for service_name in self.list_services ():
  File "/usr/lib/python2.5/site-packages/slip/dbus/polkit.py", line 48, in enable_proxy_wrapper
    return func (*p, **k)
  File "/usr/lib/python2.5/site-packages/scservices/dbus/proxy/serviceherders.py", line 66, in list_services
    return self.dbus_object.list_services (dbus_interface = "org.fedoraproject.Config.Services.ServiceHerder")
  File "/usr/lib/python2.5/site-packages/dbus/proxies.py", line 68, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python2.5/site-packages/dbus/proxies.py", line 140, in __call__
    **keywords)
  File "/usr/lib/python2.5/site-packages/dbus/connection.py", line 630, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.AccessDenied: A security policy in place prevents this sender from sending this message to this recipient, see message bus configuration file (rejected message had interface "org.fedoraproject.Config.Services.ServiceHerder" member "list_services" error name "(unset)" destination ":1.64")


Expected results:
works 

Additional info:
when I start it like a root, it works