By default, Windows Server 2012 does
not recognize the telnet command.

If you want to start using telnet on your Windows Server
2012, then you need to install the Telnet Client
Feature.
-
Open Server Manager

-
From the Server
Manager Dashboard page, Click on
Add roles and features

-
The Add roles and
features wizard will open, click Next to
begin

-
On the installation
type page, select Role-based or
feature-based installation and
click Next

-
On the destination
server, select a server from the server
pool and make sure that the server you
want to install Telnet on is currently highlighted (
You can manager a server pool if you had
any but this is out of the scope of this
article )

-
The Telnet Client
is a Feature,
so skip the Roles and click Next

-
From the list of
available Features, select Telnet Client
and then click Next

-
On the Confirmation page,
If you need to reboot the machine
automatically if required after installation is
completed, then select the option
Restart the destination server
automatically if required. The
Telnet Client Feature does not require any restart,
so don't select this option.
Click
Install

-
Installation will be
completed successfully and no reboot is
required. Click Close

Now, when you try to
use telnet inside command prompt, telnet will be
recognized and if you typed ? and hit
Enter, you will get a list of the
supported commands that can be used along with telnet.


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