阿里云部署RabbitMQ异常问题处理（"PLAIN login refused: user 'guest' can only connect via localhost",）

小编最近在学习RabbitMQ的相关知识，并在自己的两台阿里云服务器上做了相关实验，但是实验做的一波三折～～～
小编现在一台服务器上做了一个伪分布的实验，一切OK ！
接着，小编就在两台服务器之间使用RabbitMQ进行实验，出错了：

Traceback (most recent call last):
  File "receive.py", line 4, in <module>
    pika.ConnectionParameters(host='***********'))
  File "/home/bug/.local/lib/python3.5/site-packages/pika/adapters/blocking_connection.py", line 360, in __init__
    self._impl = self._create_connection(parameters, _impl_class)
  File "/home/bug/.local/lib/python3.5/site-packages/pika/adapters/blocking_connection.py", line 451, in _create_connection
    raise self._reap_last_connection_workflow_error(error)
pika.exceptions.ConnectionClosedByBroker: (403, 'ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile.')

这是个毛问题？小编就去查看了一下log日志，发现了错误所在：

=ERROR REPORT==== 20-May-2019::16:29:37 ===
closing AMQP connection <0.641.0> (*******:46038 -> *******:5672):
{handshake_error,starting,0,
                 {amqp_error,access_refused,
                             "PLAIN login refused: user 'guest' can only connect via localhost",
                             'connection.start_ok'}}

大体意思是，用户guest仅能通过localhost连接，既然知道了问题所在，就有解决方法了：
我们找到rabbitMQ的安装目录下的rabbit.app(在ebin文件夹下)，打开并进行修改，删除loopback_users一行的guest,保存，重启，OK，完事大吉！