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远程连接MySQL时发现如下错误：

java.sql.SQLException: null,  message from server: "Host '192.168.30.23' is not allowed to connect to this MySQL server"

解决方法：

进入MySQL的bin目录,执行如下命令：

mysql -u root -proot
mysql> user mysql;
mysql> update user set host = '%' where user = 'root';
mysql> flush privileges;

作者：itmyhome