In my experience I just run TOAF and it seems to select the available port. When I first had connection problems I tried selecting the port but it didnít improve things, now I just start the programme and donít bother with port selection.
French Mikeís screenshots above say heís connected via port 9. Iíve some saved screenshots where on one occasion I was connected to port 5 but then on another occasion port 1, without manually assigning ports.
Sorry, but as a very long term Mac user I understand little of this business of port selection. By all means try port 3 but I believe it would be a mistake to say that TOAF has to use port 3 (as shown above). Maybe someone with more insight into the mysteries of Windows might comment Ö.