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DNS Slow


After a power down for electrical work our DNS is no longer responding or responding slowly. When the servers were brought back up they show that DNS is running and I have view the DNS council but they will not respond to requests. Everything was working fine prior to the shut down.

I have 2 servers, Server 2012 that are both serving AD, DNS, and DHCP. Both servers are up and working. I do have a error in the DNS service, "The DNS server has encounter a critical error from the Active Directory. Check that the Active Directory is functioning properly. The extended error debug information (which may be empty) is "". The even contains the error.

Also checked AD and everything looks as it should as well.

Any help on this would be great.

Thank you!


Hi DNSDizzy,

Are there any errors of AD? I'm afraid the server may become unstable after the power down. We could contact the vendor to test the hardware.

To verify the cause of the problem, we could perform a network capture.

Install Network Monitor on DNS server and start a new capture. Make a query from client. We could check when the packets reach server and when the response is sent. If there is a delay between the client and server, we need to check the network devices.

Here is the guide for Network Monitor:
Network Monitor:

Best Regards,


Primary Computer Service, Inc.
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