Is it possible to use the local DNS Cache service with the DNS Firewall service so that the local DNS Cache service uses the DNS Firewall service to resolve addresses ? Yes, this feature is support on Artica v4.30 Service Pack 961 or Artica v4.40
On DNS Forwarders, where the local DNS cache is, use the first DNS field and put the IP address of the Artica Box ( not 127.0.0.1 ). For example, if your Artica server is 192.168.1.190, your local DNS Cache wil use the 192.168.1.190 to query domains and your DNS Firewall will use the DNS 2 and DNS 3 to forward queries.