W, [2015-12-08T15:38:01.993251 #37405]  WARN -- #<Bunny::Session:0x7fe07b894f78 guest@localhost:5672, vhost=/dev_prod, addresses=[localhost:5672]>: An empty frame was received while opening the connection. In RabbitMQ <= 3.1 this could mean an authentication issue.

.../.rvm/gems/ruby-2.1.2/gems/bunny-2.2.0/lib/bunny/session.rb:315:in `rescue in start': Could not establish TCP connection to any of the configured hosts (Bunny::TCPConnectionFailedForAllHosts)

conn = Bunny.new(host:  'localhost',
                  port:  '5672',
                  vhost: '/',
                  user:  'guest',
                  pass:  'guest')
 conn.start