I have installed transmission 2.75 on my GNU/Linux machine, but no matter what I do, the listening port is closed.
Trying to use port 60435 I get this result from http://www.canyouseeme.org/:
Success: I can see your service on xxx.xxx.xxx.xxx on port (60435)
Your ISP is not blocking port 60435
But in the transmission-gtk program under Tranmission Preferences and the Network tab I always get the test result that the port is closed.