What is UPnP Auto Port Mapping?
To get the best speed, P2P applications like BitComet need a public listening port. However, if you use a router with an active firewall, or use Windows Internet Connection Sharing (ICS), you will need to configure port mapping (port forwarding from gateway/router or sharing computer, to your computer). BitComet takes advantage of UPnP (Universal Plug and Play) technology, and will attempt to automatically configure the port mapping for you when the session begins. Please note: UPnP is only supported in Windows XP or above, and your hardware router must both support UPnP and have it enabled. By default, BitComet won’t release the port-mapping when you exit, but you may configure it to do so in Options → Connections Dialogs. This technology has not been consistently implemented among manufacturers and sometimes does not work. In that event, the router must be manually configured. If you do not use a router and do not use ICS, then port-forwarding, UPnP and port-mapping do not apply to y
