If the output is just to much on a busy server for example you can narrow this down to specific ports, Linux users will have probably noticed by now that grep is not available in Windows PowerShell, never fear though as ‘Select-String’ does the same job, for the most part, the example below will show you how to check specific ports in the following example port 3389. If you are expecting to be able to connect to a specific service that you know runs on a specific port and you can see it when listing the open/established ports as above yet it fails to connect there is a very good chance that you have not opened that port up in the Windows Firewall if however, you do not see that the port is listening for connections then there is a good chance that the service itself is not correctly configured so you need to look at that before the firewall. Proto Local Address Foreign Address State Right-click on the start menu and click ‘Windows PowerShell (admin), in the new PowerShell window that has just opened up type: netstat -an this will show you all open ports and which IP they are listening on: How to check open/listening ports in Windows Server-based operating systems.
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