Port 80 is the default port for http traffic. The most commonly blocked ports are port 80 and port 25. Most residential ISP's block ports to combat viruses and spam. Please refer to your routers manual or manufacturer for assistance in setting up port forwarding. This utility can verify the success of that process. When you forward a specific port on your router, you are telling your router where to direct traffic for that port. In a typical network the router has the public IP address and computers/servers obtain a private IP address from the router that is not addressable from outside the network. This allows you to run a web server, game server or a service of your choosing from behind a router. Port forwarding or port mapping allows remote computers to connect to a specific computer or service on a private network.
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