&gt; sshmux, and by extension, sshmuxd, can only forward normal sessions (ssh&#x27;ing directly to sshmuxd without a ProxyCommand) if agent forwarding is enabled.<p>This is very dangerous.<p>With the average setup, anyone with root access on the middle box can borrow the ssh key of any user connecting through it.<p>See <a href="http:&#x2F;&#x2F;unixwiz.net&#x2F;techtips&#x2F;ssh-agent-forwarding.html#sec" rel="nofollow">http:&#x2F;&#x2F;unixwiz.net&#x2F;techtips&#x2F;ssh-agent-forwarding.html#sec</a> for more info.