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 

TCPMon Tutorial

TCPMon Tutorial explains step by step details of How to debugging web service using TCPMon.

What is TCPMon & How to Use TCPMon?

Apache TCPMon is an open-source tool / debugger for checking the data flowing through TCP network. TCPMon placed intermediate to a consumer and a server. The consumer is made to contact with TCPMon, and TCPMon further send the data to the server and will shows on in its Graphical User Interface(GUI).

Apache TCPMon utility is using for monitoring soap message

You can also configure, TCPMon with Apache AXIS in order to monitor the traffic

For example if you, created webservice is deployed using Apache CXF or Apache AXIS, you can able to monitor traffic on TCP connections by using this tool