Hi @pixiboo, we'd like to check if the devices which don't work are Wi-Fi or Wired connected.   If they are Wi-Fi devices, the devices may be using 'MAC address randomization'. This is a security feature in iOS , Android and Windows 10 devices that randomly changes the MAC address of WiFi clients to stop tracking.   Unfortunately, this feature also nullifies a MAC based ACL like the parental control function on the VR1600v. ... View more