If you are an iucvconn_on_login user, you are automatically redirected and connected to the target system when you log in to iucvconn_on_login on the terminal server.
The iucvconn_on_login program is designed to connect a specific terminal server user to a terminal device on a specific target system. Use the z/VM® user ID of the target system as the user ID for opening an SSH session with the terminal server. Depending on the terminal device setup on the target system, you are then prompted to log in.
$ ssh -t <guest_id>@<terminal_server> <terminal_id>
where: $ ssh -t lxguest1@termsrv.example.net
...
lxguest1@termsrv.example.net's password:
iucvconn_on_login: Connecting to lxguest1 (terminal ID: lxterm1)
login: ...
...
[lxguest1]$ exit
logout
Connection to lxguest1 closed.$