On Thu, Jul 14, 2016 at 10:11 AM, Babatunde Busari <
[email protected]> wrote:

> Ok i have installed x1vnc
>
> apt install x11vnc
>
> and its running on port 631
>
>
What leads you to believe that x11vnc is running on port 631?

It's not impossible, but the circumstances that would lead to that are
pretty contrived. Port 631 is a privileged port [1] and is the default port
for CUPS / IPP [2], the printing system used by most Linux distributions,
including Ubuntu.

- Mike

[1] https://www.w3.org/Daemon/User/Installation/PrivilegedPorts.html
[2] https://en.wikipedia.org/wiki/Internet_Printing_Protocol

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