With all of the torrent files I’ve tried (x64 15.3 leap and 15.4 leap alpha, network and offline images) the tracker responds with “torrent not found”.
I still managed to download the isos using DHT, but it is definitely not an ideal situation.
Transmission screenshot: https://paste.pics/103edcc11a286580b4107a0a023b85c4
The transfer still happens at the maximum speed my DSL can handle – 55 Mbits/s (about 6.25 MiB/s ±0.2 MiB/s) «at least that’s what my DSL Router is indicating
» – - And, KTorrent is also indicating that, the Torrent is transferring OK …