You may want to deny access to your Server for all incoming TCP connections and UDP packets coming from certain IP Addresses.
Use the WebAdmin Interface to specify the Denied Addresses. Open the Network pages in the Settings realm, then open the Blacklisted IPs page.
The TCP and UDP Listeners consult with this IP Address list before they check their own restrictions settings.
In a Cluster environment, connections and packets from an IP Address are denied if that Address is included into either Server-wide or Cluster-wide Denied IP Addresses list.