mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication

我在使用easyPHP的时候，连mysql连不上，报错

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mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication

原因应该是密码长度或者格式不对，解决办法：

SET old_passwords = 0;
UPDATE mysql.user SET Password = PASSWORD('testpass') WHERE User = 'testuser' limit 1;
SELECT LENGTH(Password) FROM mysql.user WHERE User = 'testuser';
FLUSH PRIVILEGES;