mysql连接报错 Host ‘xxx’is blocked because of many connection errors;unblock with 'mysqladmin flush-hosts'

程序无法连接MySQL,提示:

  null, message from server: "Host '192.168.6.68' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"

原因：同一个ip在短时间内产生太多（超过mysql数据库max_connection_errors的最大值）中断的数据库连接而导致的阻塞；

解决办法：

进入mysql安装目录用mysqladmin命令执行 flush-hosts就搞定了，如在我的linux系统中

/usr/local/mysql5.5.35/bin/mysqladmin -u root -p  flush-hosts