当用户请求需要服务器发送电子邮件的内容时，我的站点出现 502 错误。我将其缩小到芹菜的问题，但我在解决它时遇到了问题。我尝试获取芹菜的状态，但收到连接被拒绝错误（回溯如下）。我也使用主管重新启动了所有流程。任何帮助将不胜感激。谢谢。
Traceback (most recent call last):
File "/home/ubuntu/Installs/my_app/bin/celery", line 9, in <module>
load_entry_point('celery==3.0.24', 'console_scripts', 'celery')()
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/__main__.py", line 14, in main
main()
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/celery.py", line 957, in main
cmd.execute_from_commandline(argv)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/celery.py", line 901, in execute_from_commandline
super(CeleryCommand, self).execute_from_commandline(argv)))
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/base.py", line 187, in execute_from_commandline
return self.handle_argv(prog_name, argv[1:])
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/celery.py", line 893, in handle_argv
return self.execute(command, argv)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/celery.py", line 868, in execute
return cls(app=self.app).run_from_argv(self.prog_name, argv)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/celery.py", line 148, in run_from_argv
return self(*args, **options)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/celery.py", line 118, in __call__
ret = self.run(*args, **kwargs)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/celery.py", line 661, in run
'ping', **dict(kwargs, quiet=True, show_body=False))
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/celery.py", line 511, in run
return self.do_call_method(args, **kwargs)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/celery.py", line 535, in do_call_method
replies = handler(method, *args[1:], **kwargs)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/bin/celery.py", line 578, in call
return getattr(i, method)(*args)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/app/control.py", line 81, in ping
return self._request('ping')
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/app/control.py", line 55, in _request
timeout=self.timeout, reply=True,
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/celery/app/control.py", line 269, in broadcast
limit, callback, channel=channel,
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/kombu/pidbox.py", line 259, in _broadcast
chan = channel or self.connection.default_channel
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/kombu/connection.py", line 776, in default_channel
self.connection
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/kombu/connection.py", line 761, in connection
self._connection = self._establish_connection()
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/kombu/connection.py", line 720, in _establish_connection
conn = self.transport.establish_connection()
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/kombu/transport/pyamqp.py", line 115, in establish_connection
conn = self.Connection(**opts)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/amqp/connection.py", line 136, in __init__
self.transport = create_transport(host, connect_timeout, ssl)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/amqp/transport.py", line 264, in create_transport
return TCPTransport(host, connect_timeout)
File "/home/ubuntu/Installs/my_app/local/lib/python2.7/site-packages/amqp/transport.py", line 99, in __init__
raise socket.error(last_err)
socket.error: [Errno 111] Connection refused
你的经纪人后端是什么？（芹菜配置文件中BROKER_URL的值）
rabbitmq-server 正在运行吗？如果没有运行它：
service rabbitmq start
然后重新启动芹菜脚本。