This is a handy little program for testing and troubleshooting. Enter a port to listen on and it will show incoming connections to that port. This can be useful if you are trying to setup connectivity through a firewall or a router. This could also be used as a secuity tool to make it appear you are running a service on a standard port, by having the tool respond, while the sevices is really running on a different port.

Very small single file is only 48k in size.

Get TCP Listen

TCP Listen