A Quick Tip To Check If A Port Is Listening On Multiple Computers

by [Published on 9 Feb. 2011 / Last Updated on 9 Jan. 2010]

This article explains how you can check if a port is listening on multiple computers.

On local computer you can always run NetStat -an command to get the list of all the ports listening on the computer. There is no support available natively on Windows Computers or there is no command line tool available to check if a specific port is listening on multiple computers or not. Let's assume we want to check if 3389 port is listening or not on the servers mentioned in the Servers.txt file. To accomplish this, you need to use the script mentioned below:

Steps:

  • 1. Create a text file: Servers.txt
  • 2. Put all the Server Names in it.
  • 3. Next, copy the following lines in a file and save it save it as CheckPort.CMD
  • REM ***START HERE***
  • Echo Off
  • SetLocal EnableDelayedExpansion
  • IF EXIST Result.csv DEL Result.csv
  • FOR /F "Tokens=*" %%L IN (Servers.txt) DO (
  •    SET ServerName=
  •    SET ServerName=%%L
  •    Psexec.exe \\!ServerName! NetStat -an > Result.txt
  •    Find /i "3389" < Result.txt
  •    IF !ErrorLevel! == 0 (
  •        Echo !ServerName!, Listening >> Result.CSV
  •    ) ELSE (
  •        Echo !ServerName!, Not Listening >> Result.csv
  •    )
  • )
  • REM ***END HERE***

The end result will be stored in a file called Result.csv.

See Also


The Author — Nirmal Sharma

Nirmal Sharma avatar

Nirmal Sharma is a MCSEx3, MCITP and was awarded the Microsoft MVP award in Directory Services and Windows Networking. He specializes in Microsoft Azure, Office 365, Directory Services, Failover Clusters, Hyper-V, PowerShell Scripting and System Center products. Nirmal has been involved with Microsoft Technologies since 1994. In his spare time, he likes to help others and share some of his knowledge by writing tips and articles on various sites and contributing to PowerShell-based Dynamic Packs for www.ITDynamicPacks.Net solutions.

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