[libvirt-users] access remote libvirtd fail

I want to manage remote libvirt , have run libvirtd in the dest host : [root@dest_host ~]# ps aux | grep libvirtd root 3293 0.0 0.1 923796 5856 ? Sl 12:59 0:00 libvirtd --daemon then I use the command in source host : 1. [root@source_host ~]# ssh -l root 211.87.***.97 ## login the dest host 2. [root@dest_host ~]# virsh -c qemu+ssh://127.0.0.1/system list --all # query vm status output: Id Name State ---------------------------------------------------- - ubuntu shut off - vdisk shut off also I use the command in source host 1. [root@source_host ~]# ssh -l root 211.87.***.97 ## login the dest host 2. [root@dest_host ~]# virsh -c qemu+ssh://211.87.***.97/system list --all ### query vm status output: Id Name State ---------------------------------------------------- - ubuntu shut off - vdisk shut off however , in the source host , execute the command : 1. [root@source_host ~]# virsh -c qemu+ssh://211.87.228.97/system list --all ### query vm status output: error: failed to connect to the hypervisor error: no valid connection error: End of file while reading data: : Input/output error I have referred to http://wiki.libvirt.org/page/Failed_to_connect_to_the_hypervisor#Other_er... , http://wiki.libvirt.org/page/SSHSetup and http://wiki.libvirt.org/page/SSHPolicyKitSetup . All of them don't work. how should I do ? Help .