You can allow authorization in the control panel via the "authinfo" parameter only for certain IP-addresses and/or networks. Read more in Guide to ISPmanager software API.
To enable restrictions:
- Enter Settings → Authorization settings.
Enable the Restrict use of authinfo option.
Restrictions apply to all panel users.
- In the "White list" for "authinfo" use, add the IP-addresses and/or networks from which authorization is allowed.
- Press Ok.