错误现象：
[root@localhost ~]# telnet 192.168.10.130 3306
Trying 192.168.10.130...
Connected to 192.168.10.130.
Escape character is '^]'.
GHost '192.168.10.120' is not allowed to connect to this MySQL serverConnection closed by foreign host
解决方法：
具体原因是权限问题，需要重新设置外部登陆用户权限
mysql> grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
Query OK, 0 rows affected (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> exit