Peer sources are usually DHT or PEX and ideally you should help find quality peers. Seeders are the people sharing the file and peer sources are the systems that help share them. Port forwarding is a meaty subject and has some extensive guides on getting bit torrent to play nicely. Any port used by QBittorrent will pass through the firewall without being slowed or blocked. Navigate to the QBittorrent.exe file and select it to be allowed. Using Comodo Firewall as an example, select Tasks, Firewall Tasks and Allow Application. Of course, if your firewall is blocking your downloads, you’ll need to add them to your whitelist. Different firewalls do things in different ways but you want to allow QBittorrent to send and receive traffic. If the port is not open, make sure you have allowed QBittorrent through your firewall and forward it in your router. Run the test again to see if the port is open. Manually set a port in QBittorrent if you like, preferable within the 49160-65534 range as others are used by other programs or are blocked by some ISPs.Visit this website and enter the port you want to check in the box.