TCPListen

PowerShell Script to open TCP port and listen for connections

Use cases

This script can be used to test firewall rules for Windows Servers located in different subnets, DMZ etc.

Parameters

-IP [IPv4 Address]

-PORT [TCP Port number]

-ListenTimeOut [Seconds]

-KeepAlive [Seconds]

Usage examples

Example below opens 443 TCP port on loopback interface and starts listening it for 1 minute. Once client is connected the session will be kept for 5 second before drop.

.\TCPListen.ps1 -IP 127.0.0.1 -PORT 443 -ListenTimeOut 60 -KeepAlive 5

Another example with output.

.\TCPListen.ps1 -IP 192.168.1.1 -PORT 443 -ListenTimeOut 20 -KeepAlive 2

07/24/2017 20:21:25 - 192.168.1.1 will listen 20 seconds on port 443 with 2 seconds keepalive, ctrl+c to cancel

Status                        Date                          Address                         Port
------                        ----                          -------                         ----
Connected                     7/24/2017 8:21:33 PM          192.168.1.2                     51068
Disconnected                  7/24/2017 8:21:35 PM          192.168.1.2                     51068
Connected                     7/24/2017 8:21:38 PM          192.168.1.3                     51073
Disconnected                  7/24/2017 8:21:40 PM          192.168.1.3                     51073

07/24/2017 20:21:45 - Listen stopped

This example listens for connections on 443 port for 20 seconds. It uses 192.168.1.1 local IP address and keeps client connection for 2 seconds. Output shows Status event (Connected or Disconnected), Date, Client IP address and client port. Also it shows when script was started and ended.