Use this outbound rule to block UDP port 3544. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\Windows Firewall with Advanced Security\Windows Firewall with Advanced Security\Outbound Rules!Windows Firewall: Block UDP port 3544 (2) REG: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall\FirewallRules!{8C2966BA-DBAC-4630-BEAE-25E11F332D63}