title: rabbitMQ federation ACCESS_REFUSED (guest login fail)
body: <p>I have set up rabbitMQ federation between  two machines  A and B,  bi-direction, </p>
  
  <p>but have the error </p>
  
  <p>{auth_failure,"ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile."}</p>
  
  <p>in the log file,  it seems the federation amqp need to access through   guest/guest  credential,  this comes to the question here: </p>
  
  <p><a href="https://stackoverflow.com/questions/23784080/rabbitmq-guest-login-failed">rabbitMQ guest login failed</a></p>
  
  <p>with existing solution to set up  test/test  here : </p>
  
  <p><a href="https://stackoverflow.com/questions/22850546/cant-access-rabbitmq-web-management-interface-after-fresh-install">Can&#39;t access RabbitMQ web management interface after fresh install</a></p>
  
  <p>I tried to make  guest/guest  also work from  another machine by running :
  rabbitmqctl set_permissions -p / guest "." "." ".*"</p>
  
  <p>but still fail to login via  guest/guest on another machine, </p>
  
  <p>in the rabbitMQ management web UI,   the user  test and guest look all the same: </p>
  
  <p>Name
  Tags
  Can access virtual hosts    Has password</p>
  
  <p>guest
  administrator   /   ●</p>
  
  <p>test
  administrator   /   ●</p>
  
  <p>but why  I still can't loging with guest/guest on another machine?   (test/test  works fine)</p>