warning: mysql_connect(): mysqlnd cannot connect to mysql 4.1+ using the old ...：
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有些程序在安装时，出现如下错误：：
Warning: mysql_connect(): 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 in K:WEB_2013www.aerchi.com******.php
这个问题主要就是因为数据库的登陆密码编码问题，将密码设置成41位，即可。
进入phpmyadmin,点击SQL。输入以下两条命令，然后执行即可。
your password替换为你自己的密码。
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