Win10 cannot use the telnet command in the cmd window by default and needs to be installed manually.
# Win10 The Telnet client is not installed by default. When using the telnet command, you will report the command. Internal or external command, operable programor batch file.
Click on the start menu window in the lower left corner and click the "Settings" button in the pop-up menu
Enter "Control" or "Control Panel" in the box and press Enter. This is one of the ways to quickly enter the control panel
Click "Uninstall a program" in the pop-up control panel, and be sure to select "Category" as the viewing type
## In the new window that pops up, click "Turn Windows features on or off"
Check "Telnet Client" and click OK to start Install telnet client
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