Hi Charles,
Hope you have already solved your problem. If not, check these recommendations for DNS:
Configuring DNS
ANI uses Domain Name Services (DNS), if available, to perform device name lookups. Different ANI functions, such as physical discovery and path determination, require different information from DNS. Therefore, their requirements for configuring DNS differ also.
Follow these guidelines for configuring DNS:
Make sure all devices have unique host names--required for physical discovery and path determination.
Verify that the workstation running the ANI Server uses DNS--required for physical discovery and path determination.
Include the domain name when configuring DNS on workstation running the ANI Server--required for path determination.
List all devices in DNS--required for path determination.
To determine a path among devices not discovered by the physical discovery process, all devices involved in the path must be listed in DNS.
Configure a single DNS server on the workstation running the ANI Server--required for path determination.
Using multiple DNS servers on this system might cause slowdowns if the primary DNS server is not functioning. In such a case, DNS lookups being serviced by the secondary or tertiary DNS servers would be significantly slower resulting in degraded performance.
ANI attempts lookups on the primary DNS server and any additional backup DNS servers. If ANI does not receive a response from any DNS server, it returns IP addresses only. These additional lookups can degrade performance so if you are experiencing DNS problems, consider disabling this lookup. See Disabling Reverse DNS Lookup for details.
If DNS is not available, ANI uses IP addresses provided that these address can be obtained from physical discovery.If you do not use DNS in your network, consider disabling this DNS lookup. See Disabling Reverse DNS Lookup.