Exchange 2019 - Unable to add DAG member

Bargavi Nagarajan 61 Reputation points

Hello All,

I have an Exchange 2019 environment. I'm trying to add second node to the DAG but getting the below error. Exchange 2019 CU7 both servers. IP less DAG.

A server-side database availability group administrative operation failed. Error The operation failed. CreateCluster errors may result from incorrectly configured static addresses. Error: An error occurred while attempting a cluster operation. Error: Cluster API failed: "CreateCluster() failed with 0x42a. Error: The service has returned a service-specific error code". [Server:]

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Ashok M 6,376 Reputation points


    Please try the below,

    1.Check the Firewall communication between the existing and the new member - cluster port, etc - Check using telnet
    2.Pre-requisites are properly installed on the second node trying to add
    3.Uninstall the windows failover cluster from server manager, reboot the server. Install the FailoverClustering role and then try adding the node to the member
    4.Turn off windows firewall if its on and try

    If you still face the issue, share the DAG tasks logs for the inner exception.

    If the above suggestion helps, please click on "Accept Answer" and upvote it.

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  1. Yuki Sun-MSFT 24,841 Reputation points

    Hi @Bargavi Nagarajan ,

    To add to what AshokM mentioned, it's also suggested to have a check at the Group Policy settings for any deny policy on the local logins,

    Computer Configuration/ windows settings / Local Policies / User Rigths Assignment / Deny Log on Locally

    Here's a similar thread which was finally found out to be related to the GPOs:
    Can't add Exchange Server 2019 server to a DAG Error:CreateCluster() failed with 0x42a

    If an Answer is helpful, please click "Accept Answer" and upvote it.
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  2. Bargavi Nagarajan 61 Reputation points

    Thank you all for your suggestions. Issue has been resolved after uninstalling & re-installing the FailoverClustering role.