uthentication to host '10.0.1.33' for user 'root' using method 'mysql_native_password' failed with message: Access denied for user 'root'@'PCName' (using password: YES)

string conDBstring = "Server=" + server + ";Uid=" + userName + ";Pwd=" + passWord + ";Database=test_db";
MySqlConnection con = new MySqlConnection(conDBstring);

con.Open();

连接mysql数据时，本机Server写localhost或10.0.1.33都可以连上，但是局域网其他电脑填10.0.1.33正确的用户名密码就报标题中的错误

需要给当前数据库开启远程权限才行，命令如下：

grant all privileges on *.* to 'root'@'%' identified by 'YourPassword' with grant option; 

在MySQL 5.5.62里按上图输入没问题，但是后来在MySQL 8.0.18里输入上面命令会报错

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version
for the right syntax to use near 'IDENTIFIED BY '123456' WITH GRANT OPTION' at line 1

此时用C# MySqlConnection连接，会报错:

Authentication method 'caching_sha2_password' is not supported.

原因：mysql版本身份验证引起的，

官网解释：https://dev.mysql.com/doc/refman/8.0/en/caching-sha2-pluggable-authentication.html

解决方法：

mysql安装目录下修改my.ini文件（如果没有就新建一个my.ini），设置mysql_native_password为默认身份验证方式

[mysqld]
default_authentication_plugin=mysql_native_password

其他设置项可参考官方文档

参考：

mysql Access denied for user 'root'@'localhost' (using password: YES)

Authentication plugin 'caching_sha2_password' is not supported问题