First add a user for the Alex client (should always be set to au).
USER = alex1 alex_pw au

Also add the following line to allow for longer login time:
CLIENT_CONNECT_TIMEOUT = 50

Assuming you have the Boxer card in serial port 0 you will have Alex connecting to port 10000. BOXID is not needed.

So in Alex you set the server IP and port (10000), use "alex1" as Login and "alex_pw" as Password.
Also check the Extend SC Timeout checkbox.
No change of ATR needed.

Restart Alex and TV.

If still not working post logs from server.