Identifying these ports can give you a warning allowing you to potentially prevent a remote attack from taking place. Being able to identify abnormal activity occurring in your network connection is accomplished through endpoint scanning.
CloseTheDoor gives you the data needed to help detect security holes and close backdoors, potentially preventing remote attacks.
Simple Port Forwarding works with webpages and not directly with your router making it a safe program to use. Supports 52 Languages and 2600+ routers. Portable version also available.