Dear All； I try to migrate a kvm guset os from Host A to Host B,but failed ================================================ Host OS : Ubuntu 11.04 server Using libvirt 0.8.8 Using API:QEMU 0.8.8 Running hypervisor:QEMU 0.14.0 =============================================== virsh migrate --live winxp quem+ssh://192.168.10.3/system root(a)192.168.10.3's password: error:operation failed:migration to 'tcp:Host B:49156' failed:migration failed =============================================== read libvirt.org FAQ,add --tunnelled FLAG ================================ virsh migrate --live --tunnelled winxp qume+ssh://192.168.10.3/system root(a)192.168.10.'s password: error: Requested operation is not vaild:cannot perform tunnelled migration without using peer2peer flag ================================================ add p2p flag ================================================ virsh migrate --live --tunnelled winxp qume+ssh://192.168.10.3/system root(a)192.168.10.'s password: error:operation failed:Failed to connect to remote libvirt URI quem+ssh://192.168.10.3/system who can help me ?