I&#x27;m looking at the man page, I had no idea about `-W`. However, what does this protect against that the standard:<p><pre><code>    ProxyCommand ssh -q &lt;jumpHost&gt; nc %h 22
</code></pre>
doesn&#x27;t protect?<p><i></i>Edit: <i></i>just tried `-W` as an addition to the line but I get<p><pre><code>   littlefish :: ~ » ssh pgsql3
   Bad stdio forwarding specification &#x27;&lt;jumpHost&gt;&#x27;
   ssh_exchange_identification: Connection closed by remote host</code></pre>