I tested the same "Tracker" in the Deluge client on windows and working normally.
So I believe it is some incompatibility of the torrent client version with the operating system.
My default system is linux.
Version: 1.3.15

Code: Select all
sudo add-apt-repository ppa:deluge-team/develop
sudo apt-get update
sudo apt-get dist-upgrade (or sudo apt-get install deluge)