Monitors that the DNS Client service is running on this domain controller. The DNS Client service (dnscache) caches Domain Name System (DNS) names and registers the full computer name for this computer. If the service is stopped, DNS names will continue to be resolved. However, the results of DNS name queries will not be cached and the computers name will not be registered. If the service is disabled, any services that explicitly depend on it will fail to start.
The DNS Client service is not running.
Verify that the DNS Client service is set to automatic start and is running.
Check the Application and System event logs to ensure that there are no systemic problems with the server.