解决方案：

默认情况下，MySQL服务器配置为不允许任何远程访问。

只允许从'localhost' 即 '127.0.0.1'IP地址连接。

此配置可以在MySQL主配置文件“/etc/MySQL/my.cnf”中找到：

bind-address           = 127.0.0.1

要使MySQL Server允许从任何远程IP地址连接，
将修改上面的行修改“0.0.0.0”
或者注释整个行：

bind-address           = 0.0.0.0
OR
#bind-address           = 127.0.0.1

重新启动MySQL服务器：

# service mysql restart
[ ok ] Stopping MySQL database server: mysqld.
[ ok ] Starting MySQL database server: mysqld ..
[info] Checking for tables which need an upgrade, are corrupt or were 
not closed cleanly..

问题

无法连接MySQL服务器，错误消息：

ERROR 2003 (HY000): Can't connect to MySQL server on 'IP address' (111)