MySQL数据库无法远程连接的解决办法

远程登陆数据库的时候出现了下面出错信息:
ERROR 2003 (HY000): Can't connect to MySQL server on 'xxx.xxx.xxx.xxx',
经过今天下午的反复纠结,关于MySql数据库无法远程连接的问题可以归结为以下几点:

1). 没有授予相应的权限:
例如，你想root使用123456从任何主机连接到mysql服务器。

mysql> GRANT  ALL  PRIVILEGES  ON  *.* TO  'root' @ '%'  IDENTIFIED BY  '123456'  WITH  GRANT  OPTION ;

mysql> GRANT  ALL  PRIVILEGES  ON  *.* TO  'jack' @’10.10.50.127’ IDENTIFIED BY  '654321'  WITH  GRANT  OPTION ;
mysql>FLUSH RIVILEGES
mysql -u root –p
mysql>use mysql;
mysql> update  user  set  host = '%'  where  user  = 'root' ;
mysql> select  host, user  from  user ;