回显信息出现UNREACHABLE

回显信息出现“UNREACHABLE”，参考信息如下：

172.0.0.100 | UNREACHABLE! => {
   "changed": false, 
   "msg": "Failed to connect to the host via ssh: \nAuthorized users only. All activities may be monitored and reported.\nroot@172.0.0.100: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).", 
   "unreachable": true
}