修改mysql的root密码后，出现Host ‘localhost‘ is not allowed to connect to this MySQL server 错误。
解决办法：
C:\Program Files\MySQL\MySQL Server 5.5\my.ini
在[mysqld]下加下面两行，
skip-name-resolve
skip-grant-tables
重启mysql的windows服务
MySql数据库：Host 'localhost' is not allowed to connect to this MySQL server
原文：http://www.cnblogs.com/jf-guo/p/6123397.html