1.% <Ctrl/]> (characters not echoed)
      TELNET> SEND NOP <Return>
      %TELNET-I-SESSION, Session 01, host nyx, port 23

      No error message indicates the connection is active. (The
      information message also indicates the connection is active.)

    2.% <Ctrl/]> (characters not echoed)
      TELNET> SEND NOP
      %TELNET-S-REMCLOSED, Remote connection closed
      -TELNET-I-SESSION, Session 01, host nyx, port 23
      TELNET>

      Indicates your connection has been broken.