We can't test-migrate a 2012R2 VM to Azure with the following error while preparing for test migration. Error ID 666 Error Message The hydration operation completed with an error: 'a873344e-24b8-4d0a-a771-1b4df5edbf99: Necessary VMBus registry settings are missing on the VM which may cause boot failure.' and user error message: 'None.'. Some features of an Azure VM environment may not work ideally. Possible causes An internal error occured while patching the VM for Azure. The machine boots in the rescue environment. I also checked the basic error messages and BCD fixes; none worked. Does anyone knows what registry items are missing? It's a really vague error.

Unable to migrate Windows Server 2012 R2 to Azure.

Sven 0

We can't test-migrate a 2012R2 VM to Azure with the following error while preparing for test migration.

Error ID 666
Error Message The hydration operation completed with an error: 'a873344e-24b8-4d0a-a771-1b4df5edbf99: Necessary VMBus registry settings are missing on the VM which may cause boot failure.' and user error message: 'None.'. Some features of an Azure VM environment may not work ideally.
Possible causes An internal error occured while patching the VM for Azure.

The machine boots in the rescue environment. I also checked the basic error messages and BCD fixes; none worked.

Does anyone knows what registry items are missing? It's a really vague error.

SadiqhAhmed-MSFT 46,116 Reputation points Microsoft Employee

2024-07-23T14:53:30.05+00:00
@Sven Thank you for posting your question on Microsoft Q&A forum. Happy to help!

The error message you are receiving during the preparation for test migration of a 2012R2 VM to Azure indicates that necessary VMBus registry settings are missing on the VM, which may cause boot failure. This error message is quite vague, and it can be challenging to determine the exact registry items that are missing.

Here are some general troubleshooting steps that you can try:

Ensure that the VM meets the minimum system requirements for Azure. You can find the system requirements in the Azure documentation.

Check if there are any conflicting applications or services running on the VM that may be preventing the preparation for test migration. You can try disabling any antivirus or firewall software temporarily to see if that resolves the issue.

Verify that the VM is up-to-date with the latest Windows updates and patches. You can try installing any pending updates and then try preparing for test migration again.

Check if there are any pending hardware or firmware updates for the VM. You can try installing any pending updates and then try preparing for test migration again.

If you are still facing issues, you can try running the System File Checker (SFC) tool on the VM to check for any corrupted system files. You can run the SFC tool by opening a command prompt as an administrator and running the command "sfc /scannow".

If none of the above steps work, you can try creating a new VM and migrating your data to the new VM. This may help to resolve any underlying issues with the original VM.

Hope these steps help you resolve the issue. Let us know if you have any further questions or if you need more specific assistance.
Sven 0 Reputation points

2024-07-29T09:10:08.4933333+00:00

Hi,

VM is up to date. We 'solved' it by inplace upgrading the machine to 2016 and then migrate it to Azure.

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Unable to migrate Windows Server 2012 R2 to Azure.

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