Navicat connection MySQL database prompt (1130-host ... is not allowed to connect to this MySql server)

Cause of the problem: The connected user account does not have the permission to connect remotely, and can only log in to the local machine (localhost).

 solution:

1. Turn off the firewall or open a certain port in the firewall

// 关闭防火墙
systemctl stop firewalld

// 或者不关闭防火墙打开端口
firewall-cmd --zone=public --add-port=3306/tcp --permanent
firewall-cmd --reload		#重载防火墙配置
firewall-cmd --list-all		#查看开放的端口

2. Modify the database table

// 登录数据库执行
update user set Host='%' where User='root';
flush privileges;

Change the host item in the user table in the mysql database from "localhost" to "%"

 3. Authorize

// 授权 myuser 使用 mypassword 从任何主机连接到 mysql 服务器
GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%' IDENTIFIED BY 'mypassword' WITH GRANT OPTION;
flush privileges;


// 授权用户 myuser 从 IP 为 192.168.1.3 的主机连接到 mysql 服务器，并使用 mypassword 作为密码
GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'192.168.1.3' IDENTIFIED BY 'mypassword' WITH GRANT OPTION;
flush privileges;