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Using telnet command to check for open ports

Issue

Checking if a port is open

Product Line

Andover Continuum, EcoStruxure Building Expert, EcoStruxure Building Operation, Field Devices, Pelco, Satchwell MicroNet, Satchwell Sigma, TAC IA Series, TAC INET, TAC Vista

Environment

Telnet Command

Cause

Possible blocked ports

Resolution

You can check if a port is open in your network by issuing the telnet command. If it is open, you will see a blank screen after issuing the command:

telnet [domainname or ip] [port]

where

  • [domainname or ip] is the domain name or IP address of the server to which you are trying to connect
  • [port] is the port number where the server is listening

If the port is open, you will see a blank screen. This will mean that connection is successful.

For example

Telnet 192.168.0.20 9001 ( this port i know is closed the result was this)

 

telnet 192.168.0.20 9003 ( This port i know is open the result was)

 

 

 

For how to enable Telnet in Windows 7 please see Enable Telnet Client on a Windows 7 PC

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