HOST is not allowed to connect to this mysql server

host主机不能访问本机的mysql服务，原因需要连接非本机的mysql的时候，默认host是localhost，我们需要将这个mysql连接权限设置成%，更改方法直接通过软件更改和命令行更改：

在mysql的数据库选择mysql这个数据库，里面有一个user表，进入表中有一个host字段将localhost值更改为%这个保存后，刷新或者重启MySQL服务都行。

登录服务器mysql查看

mysql>use mysql;

Database changed

mysql>mysql> select host,user fromuser;+-----------+------------------+

| host | user |

+-----------+------------------+

| localhost | mysql.infoschema |

| localhost | mysql.session |

| localhost | mysql.sys |

| localhost | root |

+-----------+------------------+

4 rows in set (0.00sec)

mysql>

授权访问,因为是本地连接,所以,给予了所有权限

mysql> grant all privileges on *.* to 'root'@'%'with grant option;

ERROR1410 (42000): You are not allowed to create a user with GRANT

报错，产生用户不能授权的原因是mysql 数据库中user 表中的特定用户(root) 的host 的属性值为localhost.

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

Query OK,1 row affected (0.01sec)

Rows matched:1 Changed: 1 Warnings: 0mysql>mysql>mysql> grant all privileges on *.* to 'root'@'%';

Query OK,0 rows affected (0.01sec)

mysql>mysql>flush privileges;

Query OK,0 rows affected (0.00sec)

mysql>

然后测试连接又报错了，提示说：“客户端不支持服务器请求的身份验证协议”

更改加密方式

mysql> alter user 'root'@'%' identified by '111111' password expire never;

Query OK, 0 rows affected (0.01 sec)

mysql>

更改密码

mysql> alter user 'root'@'%' identified with mysql_native_password by '111111';

Query OK,0 rows affected (0.00sec)

mysql>

刷新权限

mysql>flush privileges;

Query OK,0 rows affected (0.01sec)

mysql>

连接成功