alhevi Hello,
In the 1.7.1 update, access to the web terminal has been restricted: only the super admin (the first account created) can use it. Any additional admin accounts you create will receive a 403 Forbidden error when trying to access the web terminal. You can safely update to 1.7.1 and create new admin accounts, which will have restricted web terminal access.
If you want to completely disable the web terminal for all admin users (including super admin), you can do the following:
opencli update && opencli update --admin
touch /root/disable_openadmin_terminal_ui