更改密码：
http://jingyan.baidu.com/article/495ba841ef412d38b30edeb2.html
关闭防火墙
http://blog.csdn.net/yujicun/article/details/17419823
http://www.cnblogs.com/silent2012/archive/2015/07/28/4682770.html
1、直接关闭防火墙
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
开启远程连接：
http://jingyan.baidu.com/article/046a7b3ed85f3ef9c27fa9dc.html
