ssh到虚拟机失败

[vinllen]

我首先run到虚拟机里面，并安装ssh，并把服务跑起来

root@6b4df5596d00:/# netstat -anlp  
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      -               
tcp6       0      0 :::22                   :::*                    LISTEN      -               
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node   PID/Program name    Path

然后修改密码。
退出后，在宿主机ssh到虚拟机，一直提示Permission denied, please try again.无论我怎么重新修改密码，登陆时都失败。求教啊！！！！