Navicat 无法连接MySQL8.0 出现1251- Client does not support authentication protocol 错误

原因:mysql8 之前的版本中加密规则是mysql_native_password,而在mysql8之后,加密规则是caching_sha2_password

解决办法:把mysql用户登录密码加密规则还原成mysql_native_password.

1.打开DOS命令行，进入MySQL的bin目录，然后输入mysql -u root -p，输入密码

2、依次执行：

ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER; 

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456'; #更新一下用户的密码 

FLUSH PRIVILEGES; #刷新权限