I just tried it , but... :( 2012/3/5 Michał Kulling | IQ.pl On Mon, 5 Mar 2012 20:50:29 +0800, suyi wang wrote: > Dear all: >      I ust installed Fedora16Fedora16 X86_64 on my new machine, and > then I ran the commands as follows(ran as root): > > yum install qemu-kvm > yum install qemu > yum install libvirt > yum install virt-manager > >     then I started the libvirtd as follow: > /etc/init.d/lbvirtd start > > So , it ran well. > > However, after a few days , when I ran the command "virt-manager" , > it showed as in the attachment. > > it seemed that ti cannot connect the hipervisor. > > Then I did a little test: > I ran the conmand "virsh list" , but it didnot work,either. > > Then I used Python as follows: > import libvirt >  cc = libvirt.open(r'qemu:///system' > ) > > but it didnot work,either. > > All the test above are under root . I hope that someone can give me > some suggestiion. Thanks to all! Try: # service qemu-kvm restart # service libvirtd restart :-) -- Michał Kulling http://iq.pl/ [3] Links: ------ [1] mailto:mkulling@iq.pl [2] mailto:wangsuyi640@gmail.com [3] http://iq.pl/