补充：是在vmware上安装的centos7，利用centos7搭建了xen，想利用virt-manager 安装 domU,找的网上教程一步步设置，在设置新连接的时候，错误显示如下：
无法 recv 数据：Warning: Permanently added 'XXXXX' (ECDSA) to the list of known hosts.
Authentication failed.: Connection reset by peer
确认在远程主机中正在
运行 'libvirtd' 守护进程。
Libvirt URI is: xen+ssh://root@XXXXXX/
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/connection.py", line 862, in _do_open
self._backend.open(self._do_creds_password)
File "/usr/share/virt-manager/virtinst/connection.py", line 161, in open
open_flags)
File "/usr/lib64/python2.7/site-packages/libvirt.py", line 105, in openAuth
if ret is None:raise libvirtError('virConnectOpenAuth() failed')
libvirtError: 无法 recv 数据：Warning: Permanently added 'XXXXX' (ECDSA) to the list of known hosts.
Authentication failed.: Connection reset by peer
