Not able to Upload a file in Blob Containers?

Question

Not able to Upload a file in Blob Containers?

K Babu 0

Hi,

I am not able to Upload a file in Blob Containers?

Getting popup as "DLB-BLOCKED"

Thanks,

K Babu

K Babu 0 Reputation points

2025-11-28T15:22:50.19+00:00

I was able to upload few files, but few files not allowing and getting Blocked popup
Venkatesan S 925 Reputation points Microsoft External Staff Moderator

2025-11-28T23:00:19.7566667+00:00
Hi K Babu,

Thanks for posting question in Microsoft Q&A,

Could you share the key details below so that I can better understand the issue and guide you accordingly?

Are you uploading through the Azure Portal, Azure CLI, or any other tool?

Could you provide more details about the type and size of the files you're trying to upload?

Are there any specific permissions set on the blob/container that might restrict access?

The “DLB-BLOCKED” popup happens because some files are blocked by your computer’s security rules (not Azure).

Usually, certain file types or content (like .exe, .bat, macro files, or files with sensitive info) are not allowed.

That’s why some files upload fine, but others get blocked.

Kindly let us know if the above helps or you need further assistance on this issue.

Please "upvote" if the information helped you. This will help us and others in the community as well.
K Babu 0 Reputation points

2025-11-29T07:04:48.4066667+00:00

Uploading from Azure Explorer portal or via VDI Azure Explorer All files are JSON extension and accepted limited file size and few files are allowing and few files are not allowing, so its hampering my work
K Babu 0 Reputation points

2025-12-01T06:22:46.6066667+00:00

As i am sharing screen shot from where i am facing issue to upload JSON files,

please have look.Storage Container.jpg
K Babu 0 Reputation points

2025-12-01T06:27:04.27+00:00

few files i can able to upload in the screen shared, but few getting Blocked message
Venkatesan S 925 Reputation points Microsoft External Staff Moderator

2025-12-02T05:43:36.1466667+00:00

Hi K Babu,
DLB-BLOCKED is from VDI's Data Loss Prevention (DLP) security tool, not Azure.

It scans JSON content for sensitive info (like keys or personal data) and blocks some files while allowing others.

Ask your security/VDI team to whitelist your storage account endpoint (*.blob.core.windows.net) or change the DLP rule to "Audit" for testing.

1 answer

Your answer

K Babu 0 Reputation points

2025-11-28T15:22:50.19+00:00

I was able to upload few files, but few files not allowing and getting Blocked popup
Venkatesan S 925 Reputation points Microsoft External Staff Moderator

2025-11-28T23:00:19.7566667+00:00

Hi K Babu,

Thanks for posting question in Microsoft Q&A,

Could you share the key details below so that I can better understand the issue and guide you accordingly?

Are you uploading through the Azure Portal, Azure CLI, or any other tool?

Could you provide more details about the type and size of the files you're trying to upload?

Are there any specific permissions set on the blob/container that might restrict access?

The “DLB-BLOCKED” popup happens because some files are blocked by your computer’s security rules (not Azure).

Usually, certain file types or content (like .exe, .bat, macro files, or files with sensitive info) are not allowed.

That’s why some files upload fine, but others get blocked.

Kindly let us know if the above helps or you need further assistance on this issue.

Please "upvote" if the information helped you. This will help us and others in the community as well.
K Babu 0 Reputation points

2025-11-29T07:04:48.4066667+00:00

Uploading from Azure Explorer portal or via VDI Azure Explorer All files are JSON extension and accepted limited file size and few files are allowing and few files are not allowing, so its hampering my work
K Babu 0 Reputation points

2025-12-01T06:22:46.6066667+00:00

As i am sharing screen shot from where i am facing issue to upload JSON files,

please have look.Storage Container.jpg
K Babu 0 Reputation points

2025-12-01T06:27:04.27+00:00

few files i can able to upload in the screen shared, but few getting Blocked message
Venkatesan S 925 Reputation points Microsoft External Staff Moderator

2025-12-02T05:43:36.1466667+00:00

Hi K Babu,
DLB-BLOCKED is from VDI's Data Loss Prevention (DLP) security tool, not Azure.

It scans JSON content for sensitive info (like keys or personal data) and blocks some files while allowing others.

Ask your security/VDI team to whitelist your storage account endpoint (*.blob.core.windows.net) or change the DLP rule to "Audit" for testing.

Answer 1

The error message "DLB-BLOCKED" you are encountering while trying to upload a file to Blob Containers could be related to several issues, including permissions or network restrictions. Here are some potential causes and solutions:

Permissions: Ensure that you have the necessary permissions to upload files to the Blob Container. You may need to check your role assignments in Azure to confirm that you have the appropriate access rights.
Network Restrictions: If you are operating in a corporate environment, there may be network policies or firewalls that block certain types of uploads. Check with your network administrator to see if there are any restrictions in place.
Blob Type: Make sure you are selecting the correct blob type (Block, Page, or Append) for the file you are trying to upload. If you are uploading a .vhd or .vhdx file, it is recommended to upload it as a page blob.
File Size Limits: Check if the file you are trying to upload exceeds any size limits imposed by Azure Blob Storage. For example, block blobs have a maximum size limit for individual blocks.
Retry the Upload: Sometimes, transient issues can cause upload failures. Try to upload the file again after a short wait.

If the problem persists, consider checking the Azure Storage logs for more detailed error messages that might give further insight into the issue.

References:

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Not able to Upload a file in Blob Containers?

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