By ending a Telnet session, you make the virtual device available to a new Telnet session.
When you are connected to a system, signing off does not necessarily end your Telnet server session. The virtual display or printer device is still active and cannot be used by another Telnet session. To end the session, enter a key or sequence of keys to put the Telnet client into a local command mode. You can then type the command to end the session. Use one of the following key sequences to end a Telnet server session.
If you do not know what key or key sequence causes the client to enter command mode, consult either your system administrator or your Telnet client documentation.
You can also use the end connection (ENDCNN) parameter of the SIGNOFF command to sign off the system and end the Telnet connection. For example, SIGNOFF ENDCNN(*YES) returns you to the client system (if you only have one Telnet session established). If you have more than one Telnet session established, the command returns you to the previous system.