ERROR 1130: Host '' is not allowed to connect to thisMySQL server

今天1网友求助，说自己PHPmyadmin可以正常连接数据库，使用sqlyog报错：

ERROR 1130: Host '172.27.214.1' is not allowed to connect to thisMySQL server

root case:MySQL默认所有帐号不允许从远程登陆，只能在localhost
解决方法： 
1,修改user表
mysql -u root -p
mysql>use mysql;
mysql>update user set host = '172.27.241.1' where user ='root';
mysql>flush privileges;
2.指定授权
mysql -u root -p
mysql>use mysql;
mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'172.27.241.1' IDENTIFIED BY 'mypassword' WITH GRANT OPTION; 

mysql>flush privileges;

注意：

1.精准授权，即那个账号，哪台主机，需要哪种权限，必须写明，最好不要泛授权；

2.记着执行完每条命令要flush privileges;