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By default, the Telnet client is disabled in Microsoft Windows operating systems, which is unfortunate because it is an extremely useful tool for testing TCP connectivity with external hosts on a particular port.
It’s great if you try to solve problems with the network connection, for example if you say we have a web server that should listen on port 80 to serve HTTP traffic, but we can’t load a web page using Telnet to connect to the web server on port 80, we can check the connection.
It may be that the connection is correct, but there is a problem with the web server, or that the web server is stopped and the port does not hear at all. With Telnet, we can better understand what is happening.
What is Telnet and how does it work?
Telnet is an Internet protocol that allows you to connect to another computer on your local network or on the Internet.
Telnet was invented in 1969 and is often considered to be the precursor of the modern Internet.
Today, most users use a graphical user interface, but when Telnet was invented, there was no browser or graphical operating system. As a result, users had to rely exclusively on the command line interface.
It should be noted that Telnet still operates as it did decades ago and that Telnet customers are available for almost all platforms.
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Actually, the Telnet client still exists – but it is no longer part of the integrated tools of the standard Windows version: if you want it on your system, you must select it explicitly. Fortunately, this can also be done after the installation of Windows: All you have to do is follow these simple steps:
Enable Telnet from the control panel
- Open the control panel.
- Navigate through programs and functions.
- Select Enable or disable Windows functions in the left menu.
- Locate the Telnet client in the list and check the box on the left.
- Click OK to start installing the Telnet client.
In the command prompt, select Telnet
- Click on Start and under Search Type in CMD.
- Right-click on CMD and click Run as administrator.
- Enter the administrator password when prompted.
- Then type pkgmgr /iu : “TelnetClient” OR dism /online /Enable feature /FeatureName:TelnetClient and press Enter to activate the Telnet client.
- Use the command pkgmgr /iu : “TelnetServer” to activate the Telnet server.
Checking the Telnet installation
Once the installation is complete, we can use the Telnet client.
- Launch the command prompt by typing Command prompt in the search box of the menu bar and clicking on the returned application.
- You can also type Windows Key + R to open the execution order dialog box. Type cmd and press Enter.
- Type telnet and press Enter to access the Telnet client.
- Type help to see the supported Telnet commands.
- Type q or quit to exit Telnet.
- Type telnet google.com 80 to Telnet in Google on port 80.
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