title: ssh2_exec not executing simple command
body: <p><code>ssh_exec()</code> is refusing to execute a command in Windows.
  Here is my code:</p>
  <pre><code>&lt;?php
  $connection = ssh2_connect('localhost', 22);
  ssh2_auth_none($connection, 'root');
  
  $stream = ssh2_exec($connection, 'C:\Program Files\CCleaner\CCleaner.exe',FALSE);
  ?&gt;
  </code></pre>
  <p>It shows me the following warning: <code>Unable to request a channel from remote host in</code>.</p>