1. In the administration panel, go to Add-ons > Manage add-ons.
2. Enable the Access restrictions add-on (change its status to Active in the select box on the right).
3. Click on the gear button and choose Settings from the drop-down list to set up the add-on.
4. In the administration panel, go to Add-ons > Access restrictions.
5. On the opened page add the IPs or domain names, which need to be disabled, in the IP or Domain sections.