This option is useful if you need to control whether this computer receives unicast responses to its outgoing multicast or broadcast messages. This option determines if this computer can receive unicast responses to multicast or broadcast messages that it initiates. Unsolicited unicast responses are blocked regardless of this setting. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\Windows Firewall with Advanced Security\Windows Firewall with Advanced Security\Windows Firewall Properties\Domain Profile!Windows Firewall: Domain: Allow unicast response (2) REG: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\WindowsFirewall\DomainProfile!DisableUnicastResponsesToMulticastBroadcast