解决1251 - Client does not support authentication protocol requested by server;consider upgrading...

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。 更改加密方式 1.先通过命令行进入mysql的root账户：

mysql -u root -p

2.更改加密方式：

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：

mysql> FLUSH PRIVILEGES;

  // 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)

 

  参照 原文链接： http://www.cnblogs.com/shiysin/p/shiysin.html