telnet

ну если не ошибаюсь:
net group TelnetClients 111 /add
или:
net localgroup TelnetClients 111 /add
cmd запускать от имени администратора

значит такой группы нет. добавлять некуда.

First, Make sure that you have TelnetServer Installed On Your Computer.....


IF NOT:
Go to Control Panel - Programs and Features - Turn Windows features on or off... Make Sure the check boxes next to Telnet Client & Telnet Server are checked. Exit

Once you have it installed, Go to Command Prompt by going to the start menu, clicking "run", and typing in "cmd". Make Sure you run command prompt as an administrator.

In Command Prompt, type
net user Administrator /active:yes
This will activate the administrator account temporarily

Now, Think of a username and password that you want to login to your telnet with.....
Then Type:
net user (username) (password) /add

Now using the same username and password, Type:
net localgroup Administrators /add (username)
net localgroup /add TelnetClients
net localgroup TelnetClients /add (username)


Now to enable the Telnet Services (you won't have to do this everytime you want to start your Server):
In command prompt, type:
sc config TlntSvr start= auto


Now this is something you will have to type every time you want to start your Server:
net start TlntSvr

Although it is Started, you cannot use it quite yet,
In command prompt, type:
netsh
firewall
add portopening TCP 23 "Telnet"
DONE! You can now Access It by following the instructions below
Your Telnet Server Has Now Been Created!

To access it, Go to command prompt, type:
telnet
o
(your local ip address)
n
Then login with the username you created earlier...