Hi, Is there a way to permanently block 'no usable rule found', well at least for IPv6 dhcp multicasts (Target ff02::1:2.:547). Apparently, the firewall does not handle those rules unless a IPv6 stack is installed because a corresponding rule (add IPv6 Address) was only creatable on a computer with IPv6 enabled. A rule for dropping those requests without a log has been created and it shows no effect. Seriously, this needs to be implemented if not already since it generates several thousand(!) logs a day and it's killing ERA Server service (service needs to be restarted to service the remote Console. After a few minutes it's the same again because clients are storming ERA). Cheers Adra P.S.: Unfortunatelly, there's no way at present to locate and disable the machines and their IPv6 stack, causing those multicasts.