How does mobaXterm know whether x11 forwarding is working on remote server?
<p>When using SSH mode to connect to some linux servers:</p>
<p>For some servers, mobaxterm shows &quot;X11-forwarding  : ✔  (remote display is forwarded through SSH)&quot; and I can start some gui application in local windows.</p>
<p>For some servers, mobaxterm shows &quot;X11-forwarding  : ✘  (disabled or not supported by server)</p>
<p>My question is, how does mobaxterm know this information? On both servers I've configured /etc/ssh/ssh_config to have:</p>
<blockquote>
<p>X11Forwarding yes</p>
<p>ForwardX11 yes</p>
</blockquote>
<p>I'm not sure which config line really works so I had both. Question is, how does mobaxterm know, is it part of ssh communication to tell, whether the linux server supports ssh forwarding or not?</p>