title: Set proxy for Hosted Chef
body: <p>Im new to chef. I have set up a workstation and a hosted chef server(<code>https://api.opscode.com/organizations/org-name</code>). However when I use the <code>knife client-list</code> command it shows me an error that the connection could not be established. Im using my office network and to connect to the internet I use a proxy. 
  How do I establish the connection to the chef server using this proxy?
  I have the following details about the proxy :
  IP address, port number,domain,username,password</p>
  
  <p>I tried to add the proxy settings to <code>knife.rb</code> file as follows :</p>
  
  <pre><code>https_proxy "http://ipaddress:port"
  https_proxy_user "domain\username"
  https_proxy_pass "password"
  </code></pre>
  
  <p>But i get the following error - <code>Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy filter is denied.</code></p>
  
  <p>Please help!</p>