As you have noticed while connected to the VPN the port 50517 is blocked and while you have set into static it causes connection failure to the peers on your Torrent client. It would be great if you could set to randomize port and disable port forwarding as this feature does not work while under the VPN connection.
Afterward, restart VPN connection and torrent client to see if the issue persists. Also, you can try using a different client such as qBittorrent.
Let us know how it will go!
Best Regards,
Amoldo Siles
Customer Success Manager
NordVPN.com
Btw to test if it is really related to the VPN provider and not to local network setup and/or ISP, you could try the free VPN service from one of our prior contributors: https://pilovali.nl/free-vpn/
At the bottom you find the .ovpn file that needs to be started with the openvpn command. If it works, we need to compare the files first (check possible variable settings) and in case we have a proof that it is an issue of NordVPN.
Please note that this free VPN has limited speed and canNOT be used for regular torrent downloads. You would be blocked in case. So this is only for testing if the torrent downloaders report seeding availability.
I've tried also ... an same result a we already know.
I can relate to it. I have been using free vpns since a long time but I don't think we can trust on free vpns. https://www.bestvpn.co/de/free-vpn/ has provided a lot of information regarding it. Now I am using Express VPN and it's perfectly fine.