TCPMon Download Article describes about How to download & configure TCPMon.
TCPmon is an open-source utility for checking the data flowing on a TCP connection. TCPMon is used to place in-between a consumer and a server. The consumer is made to connect to TCPMon, and TCPMon forwards the data to server and will display on in its GUI
TCPMon utility is mainly used for monitoring / debugging web services including soap & rest
You can also see an example of monitoring / debugging a webservice using TCPMon, please check this tutorial