navicat在连接MySQL8.0及以上版本的时候，总是报错1251；原因是MySQL8.0版本的加密方式和MySQL5.0的不一样，连接会报错。下面就为大家介绍一下详细的解决办法。
1、先通过命令行进入mysql的root账户：
PS C:Windowssystem32> mysql -uroot -p
再输入root的密码：
Enter password: ******Welcome to the MySQL monitor. Commands end with ; or g.Your MySQL connection id is 18Server version: 8.0.11 MySQL Community Server - GPLCopyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.mysql>
2、更改加密方式：
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;Query OK, 0 rows affected (0.10 sec)
3、更改密码：该例子中 123为新密码
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123';Query OK, 0 rows affected (0.35 sec)
4.刷新：
mysql> FLUSH PRIVILEGES;Query OK, 0 rows affected (0.28 sec)
// 如果报错ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'%'：
则是远程访问权限不正确，先选择数据库，查看一下再更改：
mysql> use mysql;Database changedmysql> select user,host from user;+------------------+-----------+| user | host |+------------------+-----------+| mysql.infoschema | localhost || mysql.session | localhost || mysql.sys | localhost || root | localhost |+------------------+-----------+5 rows in set (0.00 sec)
最后重新启动MySQL服务，在重新连接就行了。
