Here's a tip from my colleague Ed Wilson (the Microsoft Scripting Guy) about how to use PowerShell to show TCP port connections.
Question: How can you use Windows PowerShell to display TCP port connection status?
Answer: Use the Get-NetTCPConnection command. This command appears here:
Mitch Tulloch is a nine-time recipient of the Microsoft Most Valuable Professional (MVP) award and a widely recognized expert on Windows administration, deployment and virtualization. For more information see http://www.mtit.com.
Ed Wilson is the bestselling author of eight books about Windows Scripting, including Windows PowerShell 3.0 Step by Step, and Windows PowerShell 3.0 First Steps. He writes a daily blog about Windows PowerShell call Hey, Scripting Guy! that is hosted on the Microsoft TechNet Script Center; for more PowerTips check out the Hey, Scripting Guy! blog.