Azure Migrate VMware (Agentless) Replication ErrorID 181009

During a recent migration we have been having issues with Azure Migrate VMware (Agentless) where the replication would start failing intermittently with ErrorID 181009 and Error Message:

ErrorCode: ‘1028’ VM: ‘ServerName’. Appliance: ‘ApplianceName’. Disk Id: ”. Disk path: ‘vmdk’. Error: The operation VirtualDiskSnapshotOpen failed with the error ‘Unknown error’ [Unknown error]

• We had checked all the correct permission had been applied.
• Also confirmed that we were running the VDDK 7.0 for vSphere 7.
• Confirm the password for the account didn’t contain unsupported special characters.

We used the troubleshooting link below but there was no issue listed that matched our issues.

https://learn.microsoft.com/en-us/azure/migrate/vmware/troubleshoot-changed-block-tracking-replication?context=%2Fazure%2Fmigrate%2Fcontext%2Fvmware-context#an-internal-error-occurred

During troubleshooting with VMware / Azure support we end up having to download the VMware VDDK 8.0, delete the existing VDDK from “C:\Program Files\VMware\VMware Virtual Disk Development\” and updating this with the VDDK 8.0 version.

The link to the VMware VDDK is https://developer.broadcom.com/sdks/vmware-virtual-disk-development-kit-vddk/latest/

This fixed the replication issues.