大家好，我是考100分的小小码 ，祝大家学习进步，加薪顺利呀。今天说一说解决1251 – Client does not support authentication protocol requested by server;consider upgrading…[通俗易懂],希望您对编程的造诣更进一步.
MySQL8.0使用Navicat连接不上，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。
![解决1251 - Client does not support authentication protocol requested by server;consider upgrading...[通俗易懂]](https://www.yht7.com/upload/image/20200509/up-8c397997f456e91e5cb8ecaaf1d60ec7084.png "解决1251 – Client does not support authentication protocol requested by server;consider upgrading…[通俗易懂]插图2")
更改加密方式
1.先通过命令行进入mysql的root账户：
mysql -u root -p代码100分
2.更改加密方式：
代码100分mysql> ALTER USER "root"@"%" IDENTIFIED BY "password" PASSWORD EXPIRE NEVER;
3.更改密码：
mysql> ALTER USER "root"@"%" IDENTIFIED WITH mysql_native_password BY "password";4.刷新：
代码100分mysql> FLUSH PRIVILEGES;
![解决1251 - Client does not support authentication protocol requested by server;consider upgrading...[通俗易懂]](https://www.yht7.com/upload/image/20200509/up-03c2d20e6ec20ea5af80d3bbdf1388e9d55.png "解决1251 – Client does not support authentication protocol requested by server;consider upgrading…[通俗易懂]插图4")
// 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 changed
mysql> select user,host from user;
+------------------+-----------+
| user | host |
+------------------+-----------+
| mysql.infoschema | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
+------------------+-----------+
rows in set (0.00 sec)
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