解决MySql报错：1130 - Host 'xxx' is not allowed to connect to this MySQL server的方法

解决MySql报错：1130 - Host 'xxx' is not allowed to connect to this MySQL server的方法

发现问题

使用Navicat连接MySql数据库时，未能成功，提示信息如下图：

这个错误提示已经很明确了，"不允许主机'desktop-teat9ob'连接到此mysql服务器"，知道问题所在就好解决了。

解决办法

mysql> select  Host,User,password_expired,password_last_changed,password_lifetime,Password_reuse_history,Password_reuse_time,Password_require_current from mysql.user;
+-----------+------------------+------------------+-----------------------+-------------------+------------------------+---------------------+--------------------------+
| Host      | User             | password_expired | password_last_changed | password_lifetime | Password_reuse_history | Password_reuse_time | Password_require_current |
+-----------+------------------+------------------+-----------------------+-------------------+------------------------+---------------------+--------------------------+
| %         | root             | N                | 2020-09-06 22:00:05   |              NULL |                   NULL |                NULL | NULL                     |
| 127.0.0.1 | root             | N                | 2020-09-06 22:00:05   |              NULL |                   NULL |                NULL | NULL                     |
| localhost | mysql.infoschema | N                | 2020-09-06 21:56:24   |              NULL |                   NULL |                NULL | NULL                     |
| localhost | mysql.session    | N                | 2020-09-06 21:56:24   |              NULL |                   NULL |                NULL | NULL                     |
| localhost | mysql.sys        | N                | 2020-09-06 21:56:24   |              NULL |                   NULL |                NULL | NULL                     |
| localhost | root             | N                | 2020-09-06 22:00:05   |              NULL |                   NULL |                NULL | NULL                     |
+-----------+------------------+------------------+-----------------------+-------------------+------------------------+---------------------+--------------------------+
6 rows in set (0.12 sec)

INSERT INTO `user` (`Host`, `User`, `Select_priv`, `Insert_priv`, `Update_priv`, `Delete_priv`, `Create_priv`, `Drop_priv`, `Reload_priv`, `Shutdown_priv`, `Process_priv`, `File_priv`, `Grant_priv`, `References_priv`, `Index_priv`, `Alter_priv`, `Show_db_priv`, `Super_priv`, `Create_tmp_table_priv`, `Lock_tables_priv`, `Execute_priv`, `Repl_slave_priv`, `Repl_client_priv`, `Create_view_priv`, `Show_view_priv`, `Create_routine_priv`, `Alter_routine_priv`, `Create_user_priv`, `Event_priv`, `Trigger_priv`, `Create_tablespace_priv`, `ssl_type`, `ssl_cipher`, `x509_issuer`, `x509_subject`, `max_questions`, `max_updates`, `max_connections`, `max_user_connections`, `plugin`, `authentication_string`, `password_expired`, `password_last_changed`, `password_lifetime`, `account_locked`, `Create_role_priv`, `Drop_role_priv`, `Password_reuse_history`, `Password_reuse_time`, `Password_require_current`, `User_attributes`)
VALUES('127.0.0.1','root','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','','0','0','0','0','mysql_native_password','*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9','N','2020-09-06 22:00:05',NULL,'N','Y','Y',NULL,NULL,NULL,NULL);
INSERT INTO `user` (`Host`, `User`, `Select_priv`, `Insert_priv`, `Update_priv`, `Delete_priv`, `Create_priv`, `Drop_priv`, `Reload_priv`, `Shutdown_priv`, `Process_priv`, `File_priv`, `Grant_priv`, `References_priv`, `Index_priv`, `Alter_priv`, `Show_db_priv`, `Super_priv`, `Create_tmp_table_priv`, `Lock_tables_priv`, `Execute_priv`, `Repl_slave_priv`, `Repl_client_priv`, `Create_view_priv`, `Show_view_priv`, `Create_routine_priv`, `Alter_routine_priv`, `Create_user_priv`, `Event_priv`, `Trigger_priv`, `Create_tablespace_priv`, `ssl_type`, `ssl_cipher`, `x509_issuer`, `x509_subject`, `max_questions`, `max_updates`, `max_connections`, `max_user_connections`, `plugin`, `authentication_string`, `password_expired`, `password_last_changed`, `password_lifetime`, `account_locked`, `Create_role_priv`, `Drop_role_priv`, `Password_reuse_history`, `Password_reuse_time`, `Password_require_current`, `User_attributes`)
VALUES('%','root','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','','0','0','0','0','mysql_native_password','*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9','N','2020-09-06 22:00:05',NULL,'N','Y','Y',NULL,NULL,NULL,NULL);

FLUSH PRIVILEGES;

---

问题解决。

补充

如果你想允许用户root从ip为192.168.0.8的主机连接到MySql服务器，并使用123456作为密码，可以执行下面的SQL语句：

GRANT ALL PRIVILEGES ON *.* TO 'root'@'192.168.0.8' IDENTIFIED BY '123456' WITH GRANT OPTION;
#执行下面的语句，使上面的改动生效
FLUSH PRIVILEGES;

如果你想允许用户root从ip为192.168.0.8的主机连接到MySql服务器的testdb数据库，并使用123456作为密码

GRANT ALL PRIVILEGES ON testdb.* TO 'root'@'192.168.0.8' IDENTIFIED BY '123456' WITH GRANT OPTION;
#执行下面的语句，使上面的改动生效
FLUSH PRIVILEGES;