The DNS server was unable to open the Active Directory. This DNS server is configured to use directory service information and can not operate without access to the directory. The DNS server will wait for the directory to start. If the DNS server is started but the appropriate event has not been logged, then the DNS server is still waiting for the directory to start.
See ME316685 for a very specific condition when this event may occur.
As per ME305837, this behavior can occur if you lock the system partition and remove the Everyone group from various locations.
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