Description of problem:
Interface management with virt-manager is mostly exposed via: Edit->Host Details->Network Interfaces. We will call this the 'interface viewer' ,Starting and stopping an existing interface: Select an interface from the interface viewer, use the start and stop button on the bottom list to bring interfaces up and down. but after the interface down, can not use "start poll" icon to bring it up. and when use ifup to bring network, the out put is:
[root@localhost ~]# ifup eth0
Error org.freedesktop.DBus.Error.ServiceUnknown: The name com.redhat.ifcfgrh1 was not provided by any .service files
Error org.freedesktop.DBus.Error.ServiceUnknown: The name com.redhat.ifcfgrh1 was not provided by any .service files
Error org.freedesktop.DBus.Error.ServiceUnknown: The name com.redhat.ifcfgrh1 was not provided by any .service files
Error org.freedesktop.DBus.Error.ServiceUnknown: The name com.redhat.ifcfgrh1 was not provided by any .service files

but the network still did not been activated.

Version-Release number of selected component (if applicable):
    * kernel-2.6.33.1-19.fc13
    * libvirt-0.7.7-1.fc13
    * python-virtinst-0.500.2-3.fc13
    * qemu-0.12.3-6.fc13
    * seabios-0.5.1-1.fc13
    * virt-manager-0.8.3-2.fc13 

How reproducible:

always
  
Actual results:
the network should be start

Expected results:


Additional info: