Resolving DNS Event ID: 4515 – Duplicate DNS Zones

While working on a server today I ran into a reoccurring DNS event error:

This error hits the event log every time you start the DNS Service

Source: DNS
Type: Warning
Event ID: 4515

MicrosoftDNS but another copy of the zone has been found in directory partition DomainDnsZones.Domain.local. The DNS Server will ignore this new copy of the zone. Please resolve this conflict as soon as possible.

If an administrator has moved this zone from one directory partition to another this may be a harmless transient condition. In this case, no action is necessary. The deletion of the original copy of the zone should soon replicate to this server.

If there are two copies of this zone in two different directory partitions but this is not a transient caused by a zone move operation then one of these copies should be deleted as soon as possible to resolve this conflict.

Some online searching led me to the Microsoft Knowledgebase article here.

In my case the following steps resolved the issue:

First I started with Option 1:

For Option 1: [ForestDNSZones]

1. Click Start, click Run, type adsiedit.msc, and then click OK.
2. In the console tree, right-click ADSI Edit, and then click Connect to.
3. Click Select or type a Distinguished Name or Naming Context, type the following text in the list, and then click OK:

DC=ForestDNSZones, DC=contoso, DC=com
4. In the console tree, double-click DC=ForestDNSZones, DC=contoso, DC=com.
5. Double-click CN=MicrosoftDNS, and click the zone (contoso.com). You should now be able to view the DNS records which exist in this DNS partition. If you desire to remove this partition, right-click on contoso.com and then click Delete.

Note Deleting a zone is a destructive operation. Please confirm that a duplicate zone exists before you perform a deletion.

6. If you have deleted a zone, restart the DNS service. To do this, follow these steps:

a. Click Start, point to All Programs, point to Administrative Tools, and then click DNS.
b. In the console tree, right-click contoso.com, point to All Tasks, and then click Restart.

I was able to verify the DNS Zone existed there like the event log stated.

Next I Opened the Domain level with Option 2:

For Option 2: [DomainDNSZones]

1. Click Start, click Run, type adsiedit.msc, and then click OK.
2. In the console tree, right-click ADSI Edit, and then click Connect to.
3. Click Select or type a Distinguished Name or Naming Context, type the following text in the list, and then click OK: DC=DomainDNSZones,DC=contoso,DC=com.
4. In the console tree, double-click DC=DomainDNSZones,DC=contoso,DC=com
5. Double-click CN=MicrosoftDNS, and click the zone (contoso.com). You should now be able to view the DNS records which exist in this DNS partition. If you desire to remove this partition, right-click on contoso.com and then click Delete.

Note Deleting a zone is a destructive operation. Please confirm that a duplicate zone exists before you perform a deletion.

6. If you have deleted a zone, restart the DNS service. To do this, follow these steps:

a. Click Start, point to All Programs, point to Administrative Tools, and then click DNS.
b. In the console tree, right-click contoso.com, point to All Tasks, and then click Restart.

I was again able to confirm the duplicate zone existed.

I Before making any changes I fired up my backup software and took a system state backup of my DC.

Next I removed the duplicate Zone using ADSIEdit

Finally I restarted the DNS Server Service to verify the Event Log didn’t return.