Good.  I did see that the VirtualBox networking is set to NAT
That must be the default setting.
Thanks to you all for the helpful suggestions.

On Dec 1, 4:05 am, Volker Braun <vbraun.n...@gmail.com> wrote:
> Short answer: This is safe as long as you keep the networking settings
> ("NAT") in the virtual machine the way they are set up.
>
> Only the host computer can access the virtual machine if the networking is
> set to NAT, so just like ssh port forwarding no other computer on the
> network can access the virtual machine. However, if you change the
> networking in VirtualBox (Settings->Network->Attached to:...) to, say,
> "Bridged adapter" then all computers on the network can access the virtual
> machine. In this case you should definitely set passwords in the virtual
> machine.

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