A terminal server may function in remote administration mode if either the terminal services role is not installed on the machine or the client used to invoke the session has enabled the admin controller.
A terminal emulation program running on a computer connected to the serial port on the controller. The serial port is located on the front of the controller.
A Telnet session through a SSH (Secure Shell) over a network. The Telnet session may or may not use SSH depending on how the controller is configured. Using SSH for remote administration tasks is recommended.