Detecting if ISPs are blocking torrent download
There are 2 software's you can run to attempt discovery of ISP bittorrent throttling.
Switzerland Network Testing Tool
Glasnost: Test if your ISP is shaping your traffic
More reading
you can port blocking from your isp with this site:
What is my ip - Port Scanner
but you can randomize port of torrent client that cause bypass specific port blocking from isp.