Hi,
Here is an example of what you can put into your autoexec.nos file:
tcp access deny all <---- start by blocking everyone tcp access permit 44/8 all <---- allow all 44Net on all incoming ports
as per further news (and for Maiko VE4KLM information too) the above commands result NOT effective to stop that insidious no-ampr gateway reported ... at least this happens on my latest rsync'ed Sep 15, 2015 version.
73, gus