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How does BitComet open a port on a router?įortunately many routers support Universal Plug and Play (UPnP), which simply allows BitComet to open and forward a port on the router automatically, without user intervention, then close the port when it is done being used. Enter the Internet address of your router into the address bar.

A yellow circle in the bottom right corner of your main Bitcomet interface will confirm this to be the case. No matter what speed your Internet connection may be, your download speeds can be painfully slow if your Bitcomet listen port is blocked. What to do if your BitComet listen Port is blocked? Most ISPs that block all inbound ports are shadier ones (mostly see these in south asia) where they are actually sharing a public IP with many customers. Most residential ISPs will block the common ports (80, 443, 21, 22, 23, 53, etc).

Trivial File Transfer Protocol (TFTP) – UDP port 69.What ports should I block on my firewall?įor example, the SANS Institute recommends blocking outbound traffic that uses the following ports: 0.55, BitComet uses the same port for TCP and UDP protocols.) (Port 65432 is a good choice because it’s pretty hard to forget.) BitComet uses a single TCP port to “listen” for other peers wishing to contact it. Click on the “Enable UPNP Port Mapping” check box if it is currently checked.Write down the four digit number in the “Listen Port” box.Start up Bitcomet, select “Tools” and then “Options.”.