|Knowledge Base Article #:||10015|
|Applicable Versions:||N-central 6.x, 7.x, 8.x, 9.x|
|Date Created/Updated:||April 27, 2011|
This article is to discuss common problems with the DNS service in N-central. The DNS Service is used to monitor name resolution using the device in question as the DNS server. If the device you are monitoring DNS on is not a DNS server then this will fail.
If this server is a DNS server, then try the below command to test the lookup of the IP and diagnose the issue.
- Log in to the Probe machine
- Click on Start, point to Run and type: cmd.exe and press <Enter>.
- Type: nslookup and press <Enter>.
It will return with the default DNS server and a prompt ">"
- At the prompt type "server xx.xx.xx.xx" where xx.xx.xx.xx is the IP of the device in N-central
It will return with the name and IP of the server you have chosen as the DNS server.
- Enter the URL you are looking to resolve in the N-central Service and press <Enter>
This will perform an NSLOOKUP on the target URL using the "server" you have specified (i.e. the IP of the device in N-central).
If this fails then this device is not responding to DNS requests from the probe machine and N-central has reported a "True" failure in this instance.
If this test is able to resolve the name please past the content of the CMD window into the case and inform the technician with a case comment.