当mysql数据库安装时候选择的是加密密码时候，用navicat连接时候报错1521，这时候可以cmd之后登陆mysql执行下列代码就可以了

代码：

mysql> alter user root@localhost identified by 'root' password expire never;
mysql> alter user root@localhost identified with mysql_native_password by 'root' ;
mysql> flush privileges;//刷新权限

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