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NurHossain-4331 avatar image
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NurHossain-4331 asked ·

DAG member server is not operational in exchange 2019

Need help for following issue

In our environment three mailbox server in DC site and three mailbox server in DR site.
I added all member server in DAG but two member server from DR is showing Is not Operational. More details in attach screenshots .
31714-33-dag.png

I also check cluster service is not running on that node which are showing is not operational. I try to start but no luck,
31640-35.png


office-exchange-server-administrationoffice-exchange-server-mailflowoffice-exchange-server-connectivityoffice-exchange-server-itprooffice-exchange-server-deployment
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LucasLiu-MSFT avatar image
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LucasLiu-MSFT answered ·

Hi @NurHossain-4331 ,
1. Please make sure all Exchange servers have the same version and CU.
2. Please try to reboot the Exchange server.
3. Could you confirm which account when you start the cluster service? The Cluster service is a service that requires a domain user account. The server cluster Setup program changes the local security policy for this account by granting a set of user rights to the account. Additionally, this account is made a member of the local Administrators group. Please make sure the account you are using has the correct permissions.
4. Please check the system event log and see if there have any related logs.





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Hi @NurHossain-4331 ,
Do suggestions above help? If the issue has been resolved, please click “Accept as answer” to mark helpful reply as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well.

Thanks for your understanding.



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Hi @NurHossain-4331 ,
I am writing here to confirm with you how thing going now? If the above suggestion helps, please click “Accept as answer” to mark helpful reply as an answer.Your action would be helpful to other users who encounter the same issue and read this thread.
Thanks for your understanding.



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NurHossain-4331 avatar image
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NurHossain-4331 answered ·
  1. All Exchange server version are same,

  2. Already rebooted all problematic exchange node.

  3. Local system account is used for cluster all exchange server (4 are running)
    32006-3.png
    32061-1.png

  4. we are getting following error while trying to active database.

Failed to mount database "Mailbox Database 0527633721". Error: An Active Manager operation failed. Error: The database action failed. Error: An error occurred while trying to select a database copy for possible activation. Error: The database 'Mailbox Database 0527633721' was not mounted because errors occurred either while validating database copies for possible activation, or while attempting to activate another copy. Detailed error(s):MBXDR01:An Active Manager operation failed. Error: Invalid Active Manager configuration. Error: Unable to access cluster root key (Error: An error occurred while attempting a cluster operation. Error: Cluster API failed: "OpenCluster(null) failed with 0x6d9. Error: There are no more endpoints available from the endpoint mapper") [Server: MBXDR01.mydomain.com][Database: Mailbox Database 0527633721, Server: MBXDR01.mydomain.com]

Any Idea ?

Thank You
Nur



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Hi @NurHossain-4331 ,
1. Is there a firewall between the Exchange servers? If so, please communicate with the firewall team to ensure that all ports required by Exchange have been opened and the firewall's security policy will not affect the communication between Exchanges. And make sure there is no NAT rule on it. If possible, turn off the firewall temporarily.
2. Please try to remove the server that the cluster service isn't starting on from the DAG and go to the server itself and run "Clear-Custernode" from PowerShell. Then re-add the server to the DAG and see if the issue is resolved.
3. You could run the following command to check the real-time status information about DAG:


 Get-DatabaseAvailabilityGroup <> | Format-List

In addition, are there any related error logs in the event viewer? If possible, please provide detailed error information, but please note that please cover your personal information.



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JoeMC avatar image JoeMC LucasLiu-MSFT ·

Was this resolved, have the same issue

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