Windows Firewall: Prohibit unicast response to multicast or broadcast requests

Prevents this computer from receiving unicast responses to its outgoing multicast or broadcast messages. If you enable this policy setting and this computer sends multicast or broadcast messages to other computers Windows Firewall blocks the unicast responses sent by those other computers. If you disable or do not configure this policy setting and this computer sends a multicast or broadcast message to other computers Windows Firewall waits as long as three seconds for unicast responses from the other computers and then blocks all later responses. Note: This policy setting has no effect if the unicast message is a response to a Dynamic Host Configuration Protocol (DHCP) broadcast message sent by this computer. Windows Firewall always permits those DHCP unicast responses. However this policy setting can interfere with the NetBIOS messages that detect name conflicts.

Additional Information

  1. Registry path is:

    HKEY_LOCAL_MACHINE -> SOFTWARE -> Policies -> Microsoft -> WindowsFirewall -> StandardProfile # DisableUnicastResponsesToMulticastBroadcast

  2. The Administrative Template path is:

    Network -> Network Connections -> Windows Firewall -> Standard Profile


* Making mistakes while changing registry values can affect your system adversely. We recommend you to create a System Restore point before making registry manipulation. If you're new to Registry Editor, read this beginner's guide.
** To locate the registry and administrative template path, checkout beginner's guide.
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