CurrPorts is a portable tool that can display a list of all open TCP/IP and UDP ports on a computer, allowing the user to monitor any remote activity that might be occurring. The tool offers information about the process that opened the port, the process name, path, when the process was created, and the user that created it. Then the user can choose to kill any processes that has opened a port, closing unwanted TCP connections.
CurrPorts Portable Port Monitor Screenshot:
Authors Website: nirsoft.net/utils/cports.html
License: Open Source
Download: Get CurrPorts HERE