客户端或navicat可以连mysql，PHPmyadmin或php不能连接

最新推荐文章于 2025-07-14 14:55:42 发布

原创最新推荐文章于 2025-07-14 14:55:42 发布 · 3.2k 阅读

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本文解决了一个使用PHP连接MySQL的问题，当使用旧的不安全身份验证方式时遇到连接失败的情况。文章提供了更新密码和配置文件的具体步骤。

用客户端可以连接mysql，用php函数就连不上了，报如下警告：

Warning: mysql_connect() [function.mysql-connect]: Premature end of data (mysqlnd_wireprotocol.c:554) in path/to/the/file/where/connection/script/is/written/

Warning: mysql_connect() [function.mysql-connect]: OK packet 1 bytes shorter than expected in path/to/the/file/where/connection/script/is/written/

Warning: mysql_connect() [function.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 path/to/the/file/where/connection/script/is/written/

具体原因我还不是很清楚，跟old密码长度有关？先记录下来，日后研究。解决方法如下：

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;