Azure Backup Failure - Could not communicate with the VM agent for snapshot status - Snapshot VM sub task timed out

Manoj Prabhu 1 Reputation point
2022-07-11T16:06:08.687+00:00

Hi, I have one query regarding Azure Backup Error on Azure VM.

Below are the Observation:
Extensions Provisioning : Failed (Due to that Disk Encryption shows Failed)
Antivirus Block : Not Observed any AV issues.
Network Allow : Towards Storage Flow Allowed and No recent Changes performed.
VSS Writer : Stable and Normal.
NIC config : As recommonded

For testing, I did Uninstallation of "AzureNetworkWatcherextension" which was also in Provisioning status failed. Post uninstallation i have run Network watcher to check some port flow, then could see Network watcher Extension installed automatically and provisioning shows successful.

Now i am thinking to Uninstall "AzureDiskEncryptionExtension" from Extensions+Applications option. However, Worried on below points:

  1. AzureDiskEncryptionExtension uninstallation Require Server downtime?
  2. Can proceed with AzureDiskEncryptionExtension uninstallation directly using above option OR need to disable the Azure Disk encryption and then proceed with Extension uninstallation?

Note: OS disk and Data Disk having Encryption type SSE with PMK & ADE

I have gone through MS articles, still i have queries so please share your experience/troubleshooting steps on simple way for my understanding.

Thanks for the support.

Azure Backup
Azure Backup
An Azure backup service that provides built-in management at scale.
1,114 questions
Azure Disk Encryption
Azure Disk Encryption
An Azure service for virtual machines (VMs) that helps address organizational security and compliance requirements by encrypting the VM boot and data disks with keys and policies that are controlled in Azure Key Vault.
158 questions

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  1. Manoj Prabhu 1 Reputation point
    2022-08-04T07:05:47.317+00:00

    Hi Thanks SadiqhAhmed for your kind support and followup.

    Finding:
    In Azure VM --> C:\Packages\Plugins\Microsoft.Azure.RecoveryServices.VMSnapshot found that required metadata and other files were removed.

    Steps Performed to resolve the issue:

    1. Rename the Folder "Microsoft.Azure.RecoveryServices.VMSnapshot" available in C:\Packages\Plugins
    2. Copy the "Microsoft.Azure.RecoveryServices.VMSnapshot" folder from working machine
    3. Take Registry backup

    4.Run registry key command one by one

    REG ADD "HKLM\SOFTWARE\Microsoft\BcdrAgent" /v IsProviderInstalled /t REG_SZ /d False /f

    REG ADD "HKLM\SOFTWARE\Microsoft\BcdrAgentPersistentKeys" /v IsCommonProviderInstalled /t REG_SZ /d False /f

    1. Restart Windows Azure guest agent service
    2. Trigger Backup in Azure Portal (Open VM --> Backup --> Backup Now)