title: Can't access RabbitMQ web management interface after fresh install
body: <p>I've installed the latest RabbitMQ server (rabbitmq-server-3.3.0-1.noarch.rpm) on a fresh Centos 5.10 VM according to <a href="http://www.rabbitmq.com/install-rpm.html">the instructions on the official site.</a></p>
  
  <p>I've done this many times before during development and never had any issues. However, this time I cannot log into the management web interface using the default guest/guest user.</p>
  
  <p>In the logs, I see the following:</p>
  
  <pre><code>=ERROR REPORT==== 4-Apr-2014::00:55:15 ===
  webmachine error: path="api/whoami"
  "Unauthorized"
  </code></pre>
  
  <p>What could be causing this?</p>