logout - use control-D to logout
The filer doesn't have a logout command. (Since the telnet connection and the console are multiplexed into the same session, there would be no way for a logout command to tell which connection to drop.) To log out, type control-D.
Over telnet, typing control-D disconnects the session.
On the console, typing control-D returns the console to the password prompt. If no password is set, control-D has no effect.
na_passwd(1)