解决"ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.247.128' (111)"

1. 问题描述

在连接数据库时出现连接失败信息：

xx@ubuntu:~$ mysql -h192.168.247.128 -uroot -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.247.128' (111)
xx@ubuntu:~$xx@ubuntu:~$ my