Thank you very much Brink, and sorry for the delayed answer. It works quite well. It is a very good firewall that allows to control everything, but it took me quite some time and many trials to use. It is complicated because there is no help and it doesn't say what the commands do, to what they correspond, so we have to learn by trial and error. Further more, the little help available, both online or included is very badly written, almost not understandable, what is really a pity for such a good application.