Re: [squid-users] Re: how to implement access control using connetcing hostname and port

On Friday 11 July 2014 at 13:33:26, freefall12 wrote:

> babajaga wrote
>
> > It is not their listening port ? I doubt it, how else could you use it ?
>
> i check the port using telnet and it is closed. i guess they employ
> iptables to redirect a certain range of ports to a single port.

It sounds to me like a technique known as "port knocking".

http://en.wikipedia.org/wiki/Port_knocking

http://www.portknocking.org/

Regards,

Antony.

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