UPNP NAT port mapping

Lots of people complain that "UPNP NAT" switch on Settings page doesn't work. This feature will only work if network router connected to internet supports UPNP API. You can read more about it in WIKI article here: http://en.wikipedia.org/wiki/Universal_Plug_and_Play.

Even if router does not support it, you can still manually open port. You can find a manual for your router on this web site: http://portforward.com/english/routers/port_forwarding/

Besides you don't absolutely have to open ports, download would work without that. The only problem is that other peers would not be able to initiate connection to your device, but once connection is established from your side everything would work just fine.