numerous event id 1340

2017-03-06

Question

_{Monday, March 6, 2017 6:08 AM}

Windows Server 2008 R2

i have two DHCP servers distributed between my two DC servers. in the event viewer, i get a lot of 1340s which i don't know if it's something i should be worried about or something that can be given a less urgent priority.

googling turns out something that some ACL have to be edited. is that really how to handle it?

regards,

Reno

All replies (4)

_{Tuesday, March 7, 2017 7:47 AM ✅Answered}

Hi Reno Mardo,

When you enable name protection, event 1340 may occur when multiple clients have the same FQDN. When one clients register the DNS records first, the other one may unable to register any more, and event 1340 may be recorded.

So, please check if there are conflict FQDN of clients in your environment. Here is the related information about name protection and event 1340:

https://technet.microsoft.com/en-us/library/ee404786%28v=ws.10%29.aspx?f=255&MSPPError=-2147217396

If there are no duplicated FQDN in your environment in your environment, you may ignore the event, if there is, then, related clients may unable to register DNS records, we need to find them out and rename the computers.

Best Regards,

Anne

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_{Monday, March 6, 2017 12:22 PM}

Hi,

Is it non-Windows machines that are reporting in the event logs. If so, I'm guessing you have DHCP Name Protection enabled - https://technet.microsoft.com/en-us/library/dd759188(v=ws.11).aspx. Do any of the clients reporting the problem have duplicate hostnames that are trying to register in DNS?

_{Monday, March 6, 2017 1:00 PM}

hi,

all are Windows machines. yes i have name protection enabled.

no clients reporting any errors related to this, just that i see a lot of them in event viewer of the server.

should i worry or i can leave it alone?

_{Monday, March 13, 2017 7:58 AM}