title: PuTTY configuration equivalent to OpenSSH ProxyCommand
body: <p>I'm just trying to use PuTTY to get an SSH connection to my servers.
  These servers allow incoming SSH connection only from another specific server ("MySshProxyingServer" in example below).</p>
  
  <p>Using Linux this is no problem with the <code>ssh -W</code> command.</p>
  
  <p>In PuTTY I can't find the options to create such a connection.</p>
  
  <p>Example under Linux (<code>~/.ssh/config</code>):</p>
  
  <pre><code>Host MyHostToConnectTo
      Hostname xx.xx.xx.xx
      User root
      Identityfile ~/.ssh/id_rsa
      ProxyCommand ssh MySshProxyServer -W %h:%p
  </code></pre>
  
  <p>Anyone knows how to use such a config in PuTTY?</p>