title: How to install the proxy plugin behind a proxy for vagrant
body: <p>I work on a restrictive proxied network and I currently have vagrant working on a laptop.  I had to use the proxy plugin and i had to install it off of my work network.  </p>
  
  <p>I am now on a desktop - where this is not possible (on windows) and I'm trying to configure vagrant.  The command I suspect I'm supposed to type is:</p>
  
  <p><code>vagrant plugin install --plugin-source http://rubygems.org vagrant-proxyconf</code></p>
  
  <p>Which is reporting:</p>
  
  <pre><code>Installing the 'vagrant-proxyconf' plugin. This can take a few minutes...
  Bundler, the underlying system Vagrant uses to install plugins,
  reported an error. The error is shown below. These errors are usually
  caused by misconfigured plugin installations or transient network
  issues. The error from Bundler is:
  
  Could not fetch specs from http://gems.hashicorp.com/
  
  Warning: this Gemfile contains multiple primary sources. Using `source`
  more than once without a block is a security risk, and may result in 
  installing unexpected gems. To resolve this warning, use a block to 
  indicate which gems should come from the secondary source. To upgrade
  this warning to an error, run `bundle config disable_multisource true`.
  </code></pre>
  
  <p>I'm assuming this is related to a proxy issue.  I've tried both <code>cmd</code> and <code>PowerShell</code> as well as doing the</p>
  
  <p><code>set http_proxy=xxxxx:80</code> </p>
  
  <p>Any suggestions?  I would be happy to do a manual install if thats possible somehow.</p>
  
  <p>Thanks!</p>