No, it listens on all interfaces.  However, if you run a firewall on
your client machine (which is the default on most modern O/S's), Port
4242 won't be opened to the LAN unless you specifically want it to be. 
You can use SSH tunneling (vglconnect -s) to establish a connection with
the VirtualGL Server without opening that port.

On 7/28/20 3:53 PM, stacktracer wrote:
> Is it possible to run vglclient in such a way that it only accepts
> connections from localhost -- e.g. by having vglclient listen on the
> loopback interface?
>
> Context: Hoping to avoid opening port 4242 to the LAN, for security
> reasons.
>

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