Running "system-config_firewall" fails with a python trace in RHEL6

Issue

• The command system-config-network fails with the following python error:

# system-config-firewall
Traceback (most recent call last):
  File "/usr/bin/system-config-firewall-tui", line 29, in <module>
    import fw_tui
  File "/usr/share/system-config-firewall/fw_tui.py", line 34, in <module>
    import fw_nm
  File "/usr/share/system-config-firewall/fw_nm.py", line 30, in <module>
    bus = dbus.SystemBus()
  File "/usr/lib/python2.6/site-packages/dbus/_dbus.py", line 202, in __new__
    private=private)
  File "/usr/lib/python2.6/site-packages/dbus/_dbus.py", line 108, in __new__
    bus = BusConnection.__new__(subclass, bus_type, mainloop=mainloop)
  File "/usr/lib/python2.6/site-packages/dbus/bus.py", line 125, in __new__
    bus = cls._new_for_bus(address_or_type, mainloop=mainloop)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.FileNotFound: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory