Follow these instructions to configure an Arch Linux machine as a telnet server.
To use telnet only to connect to other machines, [[pacman|install].
To configure a telnet server, installas well.
To allow telnet connections in xinetd, edit
disable = yes to
disable = no and restart xinetd service.
Enable systemd xinetd service if you wish to start it at boot time.
Testing the setup
Try opening a telnet connection to your server:
$ telnet localhost
Note that you can not login as root.