There is a quite good port forward guide
here for opening the ports. To check which ports need to be set, look at the screenshot
here, find the matching config page on your TorrenTopia, and use that number, and then another 10, if you normally don't have mroe than 10 torrents downloading simultaneously. ie If TorrenTopia has 50102 as its starting port, maybe consider opening 50102 - 50112...