I am trying to add a VHD image from my local filesystem to Azure BLOB storage. Whenever I do this after about 6 minutes I get the error "The remote server returned an error: (400) Bad Request". I use the following steps to upload the image (using Azure Resource Manager):

PS C:\Users\myuser> Set-AzureRmContext -SubscriptionId aaaaaaaa-bbbb-cccc-dddd-0123456789012

Environment           : AzureCloud
Account               : [email protected]
TenantId              : aaaaaaaa-bbbb-cccc-dddd-0123456789012
SubscriptionId        : aaaaaaaa-bbbb-cccc-dddd-0123456789012
SubscriptionName      : MySubscription
CurrentStorageAccount :

PS C:\Users\myuser>
PS C:\Users\myuser> $rgName = "MyResourceGroupName"
PS C:\Users\myuser> $urlOfUploadedImageVhd = "https://myblobaccount.blob.core.windows.net/myvirtualmachine.vhd"
PS C:\Users\myuser>
PS C:\Users\myuser> Add-AzureRmVhd -ResourceGroupName $rgName -Destination $urlOfUploadedImageVhd -LocalFilePath C:\Users\myuser\myvirtualmachine.vhd
MD5 hash is being calculated for the file  C:\Users\myuser\myvirtualmachine.vhd.
MD5 hash calculation is completed.
Elapsed time for the operation: 00:06:29
Creating new page blob of size 136365212160...
Add-AzureRmVhd : The remote server returned an error: (400) Bad Request.
At line:1 char:1
+ Add-AzureRmVhd -ResourceGroupName $rgName -Destination $urlOfUploaded ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : CloseError: (:) [Add-AzureRmVhd], StorageException
    + FullyQualifiedErrorId : Microsoft.Azure.Commands.Compute.StorageServices.AddAzureVhdCommand

I have no idea how to debug this further? I would very much appreciate any help in finding out what is going wrong.

3 Answers 3


Your Azure Storage Account type is "Blob Storage". According to docs, it doesn't do page blobs, which are required for VMs.

Fix this by uploading into a General Purpose storage account. More info in my blog.

  • Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.
    – Jenny D
    Jul 6, 2017 at 7:06
  • Ok, that may be why - but wouldn't it make sense for the Add-AzureRmVhd to check the type of storage and simple issue a warning message? The 400 is not very helpful.
    – Yooakim
    Jul 14, 2017 at 8:06
  • Jenny: All the relevant information is there: 1) Storage Account is of wrong type 2) How to fix this What else would you like to see there? Jul 14, 2017 at 16:37
  • Yooakim: I agree on your point there. As I don't work for Microsoft, I have no idea why they don't make their error message more informative. Jul 14, 2017 at 16:39

Add -Debug switch to see the actual REST calls.


It might help to try manually uploading a page blob on the azure portal website to find the cause of the issue. For a VHD you need a page blob. Note that these are not supported on zone redundant storage accounts. More details can be found here.

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