远程连接mysql报错的问题

B服务器连接A服务器的mysql没问题，C服务器连接A服务器的mysql就连不上。

测试出现了不同的问题：

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

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/

在A服务器修改：

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;

后来又出现如下错误；

2、Can't connect to MySQL server on 'ip' (13)

在C服务器，执行：

解决方法1、：setsebool -P httpd_can_network_connect_db=1

解决方法2、：修改/etc/selinux/config SELINUX=enforcing 为 SELINUX=disabled

尼玛终于成功了。