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                              使用PHPMYADMIN时报错: 
Client does not support authentication protocol requested 
by server; consider upgrading MySQL client 
官方的说法是 
MySQL 4.1 and up uses an authentication protocol based on a password hashing algorithm that is incompatible with that used by older clients. ..... 
如果你升级mysql到4.1以上版本后遇到以上问题,请先确定你的mysql client 是4.1或者更高版本.(WINDOWS下有问题你就直接跳到下面看解决方法了,因为MYSQL 在WINDOWS是client和server一起装上了的) 
请使用以下两种方法之一 
其一: 
mysql SET PASSWORD FOR 
- 'some_user'@'some_host' = OLD_PASSWORD('newpwd'); 
其二: 
mysql UPDATE mysql.user SET Password = OLD_PASSWORD('newpwd') 
- WHERE Host = 'some_host' AND User = 'some_user'; 
mysql FLUSH PRIVILEGES; 
(出处:Viphot)