I've come to the realization that i cannot fix my NAT error at the current house I am living at because I cannot forward the ports. (Fortunately I'm moving to my own house in a few weeks)

Dont worry, I'm only using public trackers right now.

My question is... why is it that when i am downloading with azureus people can upload off of me, but once it has finished and begins seeding people are not able to?