Telnet feature/ program is not installed on the server.
Customer cannot add the Telnet feature due to restrictions in the Environment or for permission they need to follow ITIL standards.
'telnet' is not recognized as an internal or external command,
operable program or batch file.
By default, Windows does not install the telnet.exe program
Windows OS: 2008, 2008R2, 20012, 2012R2, 2016 etc
Powershell command: Test-NetConnection command supports ping test, TCP test, route tracing, and route selection diagnostics.
Example: Test a connection to a remote host on a specific port
Test-NetConnection -ComputerName "www.google.com" -port 80
Note: In the Computer Name field you can specify : Hostname /IP address.
Test-NetConnection -ComputerName "www.google.com" -port 80 -InformationLevel "Detailed"