If you are using "Transmission Web Interface" it is possible that a host server is blocking you ... Regardless of torrent client it will work properly if it is configured correctly ... I tried Transmission 300 and everything works fine ...
Try different client and uninstall if you are not satisfied:
Transmission Guide [Port Forwarding]:
If it doesn't resolve your issue ask helpdesk:
[If this answer your question pls! Upvote] ...