Client does not support authentication protocol requested by server; consider upgrading MySQL client

Client does not support authentication protocol requested  by server; consider upgrading MySQL client

场景：用户的db为mysql4.0.27，他们需要mysql5的db，我就在mysql5.0.45上为用户新创建一个db，然后用户安装自己的web项目，却提示如下：

Client does not support authentication protocol requested by server; consider upgrading MySQL client  

原因：MySQL 4.1 and up uses an authentication protocol based on a password hashing algorithm that is incompatible with that used by older clients. .....

解决方法：

请使用以下两种方法之一

其一:

mysql> SET PASSWORD FOR -> 'some_user'@'some_host' = OLD_PASSWORD('newpwd'); ##开始我修改密码时使用：set password for username = password("passowrd");就是因为password（）函数的问题，替换成和OLD_PASSWORD（）就正常了！

其二:

mysql> UPDATE mysql.user SET Password = OLD_PASSWORD('newpwd') -> WHERE Host = 'some_host' AND User = 'some_user'; mysql> FLUSH PRIVILEGES; 上面红色的部分请按自己实际情况修改....