Host is not allowed to connect to this MySQL server 错误的处理方法

方法1：

mysql>use mysql;

mysql>update user set host = '%' where user = 'root';

mysql>select host, user from user;

方法2：

mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'mypassword' WITH GRANT OPTION;

mysql>flush privileges;

说明：%是哪个IP地址可以访问这个MYsql服务，可以换成你想要的IP地址！