title: Can't connect RabbitMQ node to cluster
body: <p>I've just installed rabbitmq on 2 new VMs and tried to create a simple two node cluster. I've copied the erlang cookie file from one machine to both locations on that machine (C:\Users{username} and C:\Windows\System32\config\systemprofile) and  those locations on the other machine as well.</p>
  
  <p>When I try to join one to the other to create a cluster using the rabbitmqctl join_cluster command, I get the following output:</p>
  
  <pre><code>Clustering node rabbit@{machinename1} with rabbit@{machinename2}
  Error: unable to perform an operation on node 'rabbit@{machinename2}. Please see diagnostics information and suggestions below.
  
  Most common reasons for this are:
  
   * Target node is unreachable (e.g. due to hostname resolution, TCP connection or firewall issues)
   * CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)
   * Target node is not running
  
  In addition to the diagnostics info below:
  
   * See the CLI, clustering and networking guides on http://rabbitmq.com/documentation.html to learn more
   * Consult server logs on node rabbit@{machinename2}
  
  DIAGNOSTICS
  ===========
  
  attempted to contact: ['{machinename2}']
  
  rabbit@{machinename2}:
    * connected to epmd (port 4369) on {machinename2}
    * epmd reports node 'rabbit' uses port 25672 for inter-node and CLI tool traffic
    * TCP connection succeeded but Erlang distribution failed
  
    * Hostname mismatch: node "rabbit@{machinename2}" believes its host is different. Please ensure that hostnames resolve the same way locally and on "rabbit@{machinename2}"
  
  
  Current node details:
   * node name: 'rabbitmqcli60@{machinename1}'
   * effective user's home directory: {homedirectory}
   * Erlang cookie hash: {hash}
  </code></pre>
  
  <p>Everyone on the internet seems to be saying that this is caused by having cookie mismatches, but I've verified that they're the same. What am I missing here?</p>
  
  <p>Running Erlang OTP 20.2 and rabbitMQ 3.7.3</p>