title: Vagrant/VirtualBox not connecting ("Connection refused. Retrying...")
body: <p>I'm using Vagrant 1.7.2 and VirtualBox 4.3.28 (basically the latest builds as of the date) on Windows 8. I'm having trouble ssh-ing into the VM via <code>vagrant up</code>.</p>
  
  <p>Here is the message I get:</p>
  
  <pre><code>$ vagrant up
  Bringing machine 'default' up with 'virtualbox' provider...
  ==&gt; default: Checking if box 'hashicorp/precise32' is up to date...
  ==&gt; default: Clearing any previously set forwarded ports...
  ==&gt; default: Clearing any previously set network interfaces...
  ==&gt; default: Preparing network interfaces based on configuration...
      default: Adapter 1: nat
  ==&gt; default: Forwarding ports...
      default: 22 =&gt; 2222 (adapter 1)
  ==&gt; default: Booting VM...
  ==&gt; default: Waiting for machine to boot. This may take a few minutes...
      default: SSH address: 127.0.0.1:2222
      default: SSH username: vagrant
      default: SSH auth method: private key
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
      default: Warning: Connection refused. Retrying...
  </code></pre>
  
  <p>I have a feeling this has something to do with my private key, but I have no idea how to solve it.</p>
  
  <p>Here is my Vagrant file, which is basically the default one:</p>
  
  <pre><code>Vagrant.configure(2) do |config|
      config.vm.box = "hashicorp/precise32"
  end
  </code></pre>