想让另一台服务器上的代码连接一台万网服务器上的数据库，但是却一直连不上数据库，报出下面的错误：

mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication. Please use an administration tool to reset your password with the command SET PASSWORD = PASSWORD('your_existing_password'). This will store a new, and more secure, hash value in mysql.user. If this user is used in other scripts executed by PHP 5.2 or earlier you might need to remove the old-passwords flag from your my.cnf file

解决的办法，通过navicat for mysql连接数据库，在命令行执行下面的语句：

SET SESSION old_passwords = FALSE;  

SET PASSWORD = PASSWORD('your existing password in plain text');  

再次运行连接数据库的代码，能够正常连接数据库了。