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6. Click the Monitoring tab. Put checkmarks in the A simple query against this DNS
server and A recursive query to other DNS servers check boxes. Then click the Test
Now button. Note in the Test results frame that the Simple Query shows a Pass, while
the Recursive Query displays a Fail. The reason is that an Access Rule has not been
created that allows the caching-only DNS server access to the Internet. Later, we will
create an Access Rule on the ISA Server 2004 firewall that allows the DNS server
outbound access to DNS servers on the Internet.
ISA Server 2004 Configuration Guide 58