Turn of Multicast Name Resolution with Group Policy

Question

_{Monday, August 10, 2015 5:56 PM}

So we are trying to disable Multicast Name resolution on our domain using Group Policy. First of all I am pretty familiar with Group Policy and make changes all the time.

I went in to Group Policy and under Computer Configuration\Administrative Templates\Network\DNS Client\Turn off Multicast Name Resolution and I enabled it as according to the knowledge base enabling this GP will disable the protocol

I put a few test machines in a AD container and forced a gpupdate on them. All the changes I made took effect except this one which seems to remain in an unconfigured state on the client machine?

Is there some magic trick to get this to function?

All replies (3)

_{Wednesday, August 12, 2015 7:44 AM ✅Answered | 1 vote}

Hi Rick-D,

Based on my understanding, you want to turn off multicast name resolution use group policy, but it doesn’t work.

We may verify if this policy is really applied by checking regedit.

The registry key is: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient

If the policy is enabled, double click “enablemulticast”, the value data is “0”.

Best regards,

Anne he

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_{Friday, August 14, 2015 9:53 AM ✅Answered}

Hi rick-d,

Thanks for feeding back. In my lab, when I haven’t configure “turn off multicast name resolution”, the register key doesn’t exit. If we configure it, system will create the file “enablemulticast” in register. If we modify the configuration in GP as “not configured”, the file will disappear if we enter register again. However, if we modify the value in “enablemulticast” manually, group policy will not change the configuration in it.

In theory, if we want to enable the policy, we have to make sure that the value in register is correct.

Besides, have you turned off multicast name resolution in your lab successfully?

Best regards,

Anne he

Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected].

_{Wednesday, August 12, 2015 6:07 PM}

Thanks for the info. I was trying to find the registry key on microsoft's site but couldn't locate an article that told which one to look for. This was very helpful. Strange that it doesn't show through gpedit locally but the registry option is definitely set. I looked at a machine where the policy is not applied and key does not exist at all. Look at a machine with the new policy applied and the key is there and set to 0 but still local gpedit shows it as 'Not Configured'

Other options I changed in the new GP show in local gpedit but not this one for some strange reason.

Seeing the key get created on machines I am setting the policy on makes me feel better

Thanks again Anne