title: Warning: No xauth data; using fake authentication data for X11 forwarding
body: <p>I have an unfortunate problem when making ssh connections from Fedora 23 to Centos 7. The commands <code>ssh -X user@centos7</code> and <code>ssh -Y user@centos7</code> both print <strong>Warning: No xauth data; using fake authentication data for X11 forwarding.</strong></p>
  
  <p>Googling shows to add the following lines to /etc/ssh/ssh_config:</p>
  
  <pre><code>Host *
      ForwardX11Trusted yes
      ForwardAgend yes
      ForwardX11 yes
  </code></pre>
  
  <p>But this didn't make the warning message go away.</p>