Azure BlobClient download access denied for target folder

To allow an Azure app to write to a local folder, you need to grant write permissions to the user account that the app is running under. You can do this by adding the user account to the folder's security settings. If you don't know the user account that the app is running under, you can try granting write permissions to the "Everyone" group. However, this is not recommended for security reasons.

It's worth noting that the "Access Denied" error you're seeing may not be related to the local folder's security settings. It could also be caused by incorrect credentials or insufficient permissions on the Azure Blob Storage side. Double-check that you're using the correct credentials and that the app has the necessary permissions to access the blob.

References:

• SQL Server backup to URL for Microsoft Azure Blob Storage - Security for Azure Blob Storage
• SSH File Transfer Protocol (SFTP) support for Azure Blob Storage - SFTP permission model

Hi a03.Craig_Pennington,

Thank you for posting in the Q&A Forums.

Check local folder permissions:

Make sure that the application or service account running the download has enough permissions to write to the destination folder. You can check and modify folder permissions via the Properties -> Security tab in File Explorer.

If you are not sure which user account is running your application, you can check the user name of the process running the application via Task Manager.

Run the application as an administrator:

Try running your application as an administrator, which usually solves the problem of insufficient permissions. On Windows, you can do this by right-clicking on the application's shortcut or executable file and selecting “Run as administrator”.

Modify your application's startup configuration:

If your application is running as a service, check whether the login account of the service has enough privileges to access the target folder. You can change the login account in the properties dialog of the service.

Use credentials with appropriate permissions:

If your application needs to interact with Azure Blob storage and the local file system, make sure it uses credentials with appropriate permissions to perform these operations. For Azure Blob storage, this usually involves the storage account's access key or SAS (Shared Access Signature).

Check the file paths in your code:

Make sure you are using the correct file path in your code and that the folder pointed to by that path actually exists. Incorrect file paths or non-existent folders can also cause “Access Denied” errors.

Use the correct download method:

Ensure that you are using the BlobClient's download methods (such as DownloadToAsync or DownloadTo) with the correct parameters, including the destination file path and any necessary options.

Review logs and error messages:

Carefully review the application logs and error messages for more contextual information about the “Access Denied” error. This will help determine if the problem is indeed related to local file system permissions.

Best regards

NeuviJ

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