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Event ID: 4001 Source: DNS-Server-Service

Level
Description
The DNS server was unable to open zone 1.16.172.in-addr.arpa in the Active Directory. This DNS server is configured to obtain and use information from the directory for this zone and is unable to load the zone without it. Check that the Active Directory is functioning properly and reload the zone. The event data is the error code.
Comments
 
This error indicates that AD DS is not responding to requests from the DNS Server service. Ensure that AD DS is functioning properly, troubleshoot any problems, and then reload the zone. See T774609 for details.

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