[root@dest_host ~]# ps aux | grep libvirtd 

root      3293  0.0  0.1 923796  5856 ?        Sl   12:59   0:00 libvirtd --daemon

 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:

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

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:

I have referred to 

   http://wiki.libvirt.org/page/Failed_to_connect_to_the_hypervisor#Other_errors ,     

   http://wiki.libvirt.org/page/SSHSetup and 

   http://wiki.libvirt.org/page/SSHPolicyKitSetup . 

All of them don't work.

how should I do ? Help .