The validation fails when you run a cluster validation wizard for a Windows Server 2008 cluster

This article provides a resolution for a problem in which a duplicate address error occurs when you validate a Windows Server 2008 failover cluster.

Applies to:   Windows Server 2012 R2
Original KB number:   969256

Symptoms

When you run a cluster validation wizard for a Windows Server 2008 cluster, the validation fails. Additionally, you may receive an error that resembles the following error message:

Verifying that there are no duplicate IP addresses between any pair of nodes.

Found duplicate physical address 02-10-18-39-6D-38 on node servername.domainname.com adapter Local Area Connection 19 and node server2name.domainname.com adapter Local Area Connection 19.

Found duplicate IP address fe80::100:7f:fffe%14 on node servername.domainname.com adapter Local Area Connection 11 and node server2name.domainname.com adapter Local Area Connection 11."

Cause

This problem occurs when only one of the following conditions is true:

• The Teredo transition technology is enabled on a Windows Server 2008 cluster node. Teredo allows IPv6 communications to pass through IPv4 NATs and IPv4 servers. However, Teredo gives the same IPv6 address to its network interfaces. Failover clustering flags this as an error because it requires unique IP addresses.
• The referenced servers are built from the same image and automatically create the Cluster NetFT adapter on each node with an identical MAC address. Failover clustering flags this as an error because it requires unique physical addresses.

Resolution

There are two possible solutions, depending on the combination of error messages that you receive.

Issue 1

If the error message doesn't include a reference to a "duplicate physical address," Teredo is most likely the cause of the problem. To resolve this problem, disable Teredo by using one of the following two methods.

Method 1: Turn off Teredo by using a Netsh command

1. Click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.

   Note

   If the User Account Control dialog box appears, confirm that the action that the dialog box displays is what you want, and then click Continue.

2. At the command prompt, type the following lines (press ENTER after each line):

   netsh
   interface
   teredo
   set state disabled
   

3. Close the command prompt.

Method 2: Turn off Teredo by specifying a registry setting in Windows Server 2008

1. For best results, close all programs on the computer on which you're changing the registry setting.

2. Click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.

   Note

   If the User Account Control dialog box appears, confirm that the action that the dialog box displays is what you want, and then click Continue.

3. Type regedit at the command line.

4. Locate to the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6

5. Right-click Parameters, click New, click DWORD, and then type the name DisabledComponents for the new value. Make sure that you type the name exactly as shown, including capitalization. Then, click Enter.

6. Double-click DisabledComponents.

7. In the Edit DWORD Value dialog box, click Hexadecimal under the Base field, and then type 8 in the Value data field.

8. Click OK.

9. Restart the computer.

   Note

   You can also disable Teredo by using Device Manager. However, this only disables the Teredo adapter so that the system does not show the adapter anymore. This does not disable the underlying logic for Teredo. This could cause issues later. Therefore, we recommend that you disable Teredo through the command line or through the registry entry.

Issue 2

If the error message includes a reference to a "duplicate physical address," the problem most likely occurs because the referenced servers are based from the same image. To resolve this issue, remove and then reinstall the Failover Cluster feature. To do this, follow these steps:

1. Remove the Failover Cluster feature. To do this, follow these steps:

   1. Open Server Manager.
   2. In the navigation pane, click Features, and then click Remove Features.
   3. Click to clear the Failover Clustering check box.
   4. Review the warning dialog box to make sure that you're prepared to continue. Click Yes, and then click Next.
   5. Verify that the options that you want are being removed, click Remove, and then click Close.

2. Reinstall the Failover Cluster feature. To do this, follow these steps:

   1. Open Server Manager.
   2. In the navigation pane, click Features, and then click Add Features.
   3. Click to select the Failover Clustering check box, and then click Next.
   4. Verify that the options that you want are being added, click Install, and then Close.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.

For more information about the Teredo transition technology, visit the following Web sites:

Internet Protocol Version 6, Teredo, and Related Technologies in Windows Vista

For more information about how to run the cluster validation wizard for a failover cluster in Windows Server 2008, visit the following Web site:

Failover Cluster Step-by-Step Guide: Validating Hardware for a Failover Cluster