Starting torrents

I'm experimenting with how to start a torrent. I've tossed qBittorrent 4.3.3 on a server, turned on its tracker, and made a private torrent for a random game. The tracker and client ports are open, the client's seeding, but new connections hang at "Downloading metadata". I tried a public torrent too with no luck. Not sure what I'm missing, but here's the magnet link for my test if anyone has suggestions.

magnet:?xt=urn:btih:118b2e72c0cd05b7d738029995d34c9fd4c3bca2&dn=Need%20for%20Speed%20-%20ProStreet%20(USA)%20(Rev%201).nkit.iso&tr=http%3a%2f%2f71.245.171.35%3a9000%2fannounce