Windows – ‘Telnet’ is not recognized as an internal or external command

KB ID 0000455 Dtd 18/09/12


Telnet client from Windows, and have it as an “Optional Extra”. For most people that’s fine, but for anyone who programs network devices, or needs to test that ports are open, or test mail flow by telnet to port 25, that’s a pain.


Enabling Telnet – Windows 8, 7, Vista, and Server 2008 (NOT R2)

1. Open a command Window and execute the following command;

pkgmgr /iu:”TelnetClient”

Telnet not recognized


2. Control Panel > Programs > Turn Windows features on or off > Select “Telnet Client” > OK.

Note: On Windows 8, Press Windows Key+X to get straight to control panel.

Add Telnet

Enabling Telnet – Windows Server 2012

1. From PowerShell execute the following command;

Add-WindowsFeature Telnet-Client

Server 2012 Enable Telnet

Enabling Telnet – Windows Server 2008 R2

1. From command line execute the following command;

servermanagercmd -i telnet-client

2008 Install Telnet


2. Launch Server Manager > Features > Add Features > Locate and select “Telnet Client”.

Add Telnet 2008 R2


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Original Article Written 31/05/11

Author: Migrated

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