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    It look slike our DAG computer account has been deleted. Its been awhile so I don't think I will be able to restore it. Can I simply remove the servers from the current DAG create a new one, then move them in there?
    Wednesday, March 25, 2015 2:18 PM

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    what you mean by DAG computer name? you mean you have removed the DAG?
    Wednesday, March 25, 2015 2:23 PM
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    When you create a DAG it create a computer account in active directory. That computer account is no longer there. I think it's actually the cluster name. 

    This looks like the exact problem but I can't restore the account.

    https://social.technet.microsoft.com/Forums/en-US/adb82086-c0bd-4c43-b41c-2f0d7c1aeb67/exchange-2010-dag-deleted-dag?forum=exchange2010

    Wednesday, March 25, 2015 2:27 PM
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    Or should I follow these steps? From https://social.technet.microsoft.com/Forums/en-US/adb82086-c0bd-4c43-b41c-2f0d7c1aeb67/exchange-2010-dag-deleted-dag?forum=exchange2010

    You can create create new CNO and replace the deleted CNO for DAG.

    • Create a new computer account for the CNO named the same as the DAG.
    • Give the DAG nodes (computer accounts) full control permission to the CNO.
    • Identify the objectGUID attribute for the CNO and make note of it. This will be added to the cluster configuration.
    • On one of the DAG nodes, use Regedit and view HKLM\Cluster and identify the value ofClusterNameResource. It will be a long ugly number and is the Cluster Name Resource GUID.
    • In Regedit on Mailbox server, browse toHKLM\Cluster\Resources\ClusterNameResourceGUID\Parameters.
    • Edit the ObjectGUID key and replace the value with the value you copied in step 3. This tells the cluster to use the new CNO.
    • Perform steps 5 and 6 on all DAG nodes.
    • Restart the Cluster service on all DAG nodes.

    Wednesday, March 25, 2015 2:37 PM
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    Hi,

    Yes. In your case, the DAG computer account has been removed, you can create a new computer account for the CNO to replace the deleted CNO for your DAG.

    For more information, here are some helpful threads for your reference.

    https://technet.microsoft.com/en-gb/library/ff367878(v=exchg.141).aspx

    http://blogs.technet.com/b/askcore/archive/2009/04/27/recovering-a-deleted-cluster-name-object-cno-in-a-windows-server-2008-failover-cluster.aspx

    Hope this can be helpful to you.

    Best regards,

    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Amy Wang
    TechNet Community Support

    • Proposed as answer by Amy.Wang Tuesday, March 31, 2015 3:07 AM
    • Marked as answer by Amy.Wang Tuesday, April 14, 2015 8:56 AM
    Thursday, March 26, 2015 6:54 AM
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    Hi,

    Any update?

    Best regards,

    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Amy Wang
    TechNet Community Support

    Monday, March 30, 2015 1:35 AM
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    I'm sorry I never got the notice to your response. I will give recreating the dag account and updating the GUID's on the two DAG members hopefully this weekend. I'm a little nervous to restart the cluster service as things are running now so waiting till off hours seems prudent. I will update as soon as I get some results. Thanks!
    Tuesday, March 31, 2015 2:03 PM
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    it was nice articles, i understand this is not a straight forward simple fix, we must undergo lot of things to resolve this issue. thanks for your response.
    Wednesday, April 1, 2015 3:17 AM
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    Hi,

    I am just writing to see if you have obtained the opportunity to test the solution. If anything is unclear with the previous information I have provided, please let me know.

    Best regards,

    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Amy Wang
    TechNet Community Support

    Wednesday, April 8, 2015 1:13 AM
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    I was able to test this over the weekend and it worked! everything is back up and running as expected. Thank you!!
    Tuesday, April 14, 2015 12:23 PM