在远程连接mysql的时候应该都碰到过，root用户无法远程连接mysql，只可以本地连，对外拒绝连接。

需要建立一个允许远程登录的数据库帐户，这样才可以进行在远程操作数据库。方法如下：默认情况下MYSQL数据库的系统数据库mysql系统表user内用户权限只提供localhost本机登陆；需要更改权限才能实现远程连接MYSQL数据库。可以通过以下方式来确认：root#mysql -h localhost -uroot -pEnter password: ******Welcome to the MySQL monitor.   Commands end with ; or \g.Your MySQL connection id is 4 to server version: 4.0.20a-debugType ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the buffer.mysql> use mysql; (此DB存放MySQL的各种配置信息)Database changedmysql> select host,user from user; (查看用户的权限情况)mysql> select host, user, password from user;+-----------+------+-------------------------------------------+| host       | user | password                                   |+-----------+------+-------------------------------------------+| localhost | root | *4ACFE3202A5FF5CF467898FC58AAB1D615029441 || 127.0.0.1 | root | *4ACFE3202A5FF5CF467898FC58AAB1D615029441 || localhost |       |                                            |+-----------+------+-------------------------------------------+4 rows in set (0.01 sec)由此可以看出，只能以localhost的主机方式访问。解决方法：mysql> Grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;(%表示是所有的外部机器，如果指定某一台机，就将%改为相应的机器名；‘root’则是指要使用的用户名，)mysql> flush privileges;    (运行此句才生效，或者重启MySQL)Query OK, 0 rows affected (0.03 sec)再次查看。。mysql> select host, user, password from user;+-----------+------+-------------------------------------------+| host       | user | password                                   |+-----------+------+-------------------------------------------+| localhost | root | *4ACFE3202A5FF5CF467898FC58AAB1D615029441 || 127.0.0.1 | root | *4ACFE3202A5FF5CF467898FC58AAB1D615029441 || localhost |       |                                            || %          | root | *4ACFE3202A5FF5CF467898FC58AAB1D615029441 |+-----------+------+-------------------------------------------+4 rows in set (0.01 sec)可以看出已经添加了一个新的用户退出，试试效果....现在可以成功登录了..