DHCP server log flooded with "DNS update request failed as the DNS update requests queue limit exceeded"

Question

_{Friday, September 11, 2015 7:20 AM}

Hi,

We recently migrated to a clustered DHCP server, running on Win 2008R2. Everything seems to be working fine, but the DHCP server log is flooded with "DNS update request failed as the DNS update requests queue limit exceeded" messages. If I restart the DHCP service, it will log succesful and failed DNS updates for a minute or two, then it will go back to flooding the log with the "DNS update request failed as the DNS update requests queue limit exceeded" messages again.

We have changed the DyanicmDNSQueueLength registry key to the highest possible value (65535), and everything else in between, such as 49152 and 32768. But yet the DHCP server log is being flooded with the same message.

Has anyone else experienced the same? I've noticed that the DNS zone corresponding to the AD DS domain is currently allowing nonsecure and secure dynamic updates. Might changing this to only allowing secure updates help?

This DHCP server services almost 10 000 clients.

All replies (1)

_{Monday, September 14, 2015 3:17 AM ✅Answered}

Hi Balthier,

Is the DHCP server added to the DnsUpdateProxy group?

Open Properties of the scope and click DNS tab, what's the update configuration?

Are all the scopes configured with the right DNS server？(Scope option 006).

If you want to enable secure dynamic update for the zone, we need to configure DNS dynamic update credentials, here are the steps:
https://technet.microsoft.com/en-us/library/dd183673(v=ws.10).aspx

Best Regards,

Leo

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