[libvirt] "Connection does not support host device enumeration"

Hi, I have "20:04.0 Network controller: Sangoma Technologies Corp. A104d QUAD T1/E1 AFT card" on Host OS, Its not visible on guest OS using linux KVM application. I did open the window for guest from virt-manager on my Ubuntu Linux Desktop 11.04, shut down the guest, then select the "Details" view from the menu on that window, and click "Add Hardware" at the bottom, select "PCI Host Device" in the selections on the left, and find your device in the list of host devices on the right. Then click "Finish". Finally, start your guest up again, and the device should appear. I get "Connection does not support host device enumeration" Any clue ? libvirt-0.8.2-22.el5 version running on CentOS Linux Server version 5.6 Please let me know if you need any additional information Regards, Kaushal