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The DNS (Name Server) monitor helps you ensure that your DNS server is functioning. The monitor queries your DNS server to resolve a specific domain name, and reports an error if the attempt fails.
Currently, DNS monitors can be created only in AlertSite 1.0 (classic interface). However, existing monitors appear both in AlertSite 1.0 and AlertSite UXM (new interface).
When setting up a DNS monitor that will run from a private location (Private Node Server or InSite), the Name to Resolve must specify a domain that is monitored from the same private location that this DNS monitor is assigned to. Otherwise, the monitor will not be able to resolve the domain name.
To create a DNS monitor:
In AlertSite 1.0, navigate to Configure > Sites and click Add a new site.
This will open the monitor configuration screen.
Change Site Type to Name Server, select a Site Plan (billing plan), and give your monitor a name.
Resolve – The domain name to resolve. Possible values are pulled from your other monitors.
Note: If this DNS monitor runs from a private location, the Resolve domain must also be monitored by some other monitor assigned to the same private location (see the Considerations above).
Click Test on Demand to test your monitor. The results will be displayed on the screen. If there are errors, double-check your DNS server name or IP address, and make sure your firewall allows connections from our IP addresses.
Your DNS monitor is now ready and will run at the specified intervals. You will see the first results in AlertSite in a few minutes.
You can change the monitor settings at any time later if you wish. See DNS (Name Server) Monitor Settings for a description of applicable settings.
Note: In AlertSite 1.0 (classic interface), only some of the displayed settings apply to DNS monitors.
Monitor status 0 indicates a successful test, and any other statuses are errors. The following table lists common error statuses for DNS monitors. For a complete list, see AlertSite Status Codes.
|1||AlertSite cannot connect to your DNS server. Make sure your firewall allows DNS queries from the IP addresses of AlertSite monitoring locations selected for your monitor.|
|3||The tested DNS server failed to resolve the domain name specified by the Resolve option.|
|51||AlertSite cannot reach your tested DNS server by its name. Double-check whether its domain name specified in the URL option is correct.|