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Michael Brown's questions

Martin Hope
Michael Brown
Asked: 2024-10-10 21:24:55 +0800 CST
  • 5

I am encountering an issue with AzCopy where my script runs perfectly fine in CMD but fails with authentication errors when executed via a batch file. Here's a breakdown of the situation:

The aim is to get our daily files backed up into storage account via task scheduler; most likely only 1 file per day/run.

My Batch Script:

@echo off
cd "C:\Program Files\AzCopy"
azcopy cp "G:\Backup\UATBackups\*" "https://<storage-account-name>.blob.core.windows.net/test/?sp=rw&st=2024-10-08T15:28:58Z&se=2024-10-08T23:28:58Z&spr=https&sv=2022-11-02&sr=c&sig=<SAS-token>" --recursive=true --block-blob-tier=Cold --overwrite=false

When I Run This Command Manually in CMD: (after navigating to the AzCopy directory)

azcopy cp "G:\Backup\UATBackups\*" "https://<storage-account-name>.blob.core.windows.net/test/?sp=rw&st=2024-10-08T15:28:58Z&se=2024-10-08T23:28:58Z&spr=https&sv=2022-11-02&sr=c&sig=<SAS-token>" --recursive=true --block-blob-tier=Cold --overwrite=false

It works perfectly, and all the files are uploaded as expected.

However, When I Run the Batch File, I Get:

RESPONSE Status: 403 Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.

I also tried modifying the batch file so it opens CMD and runs the command as if I was doing it manually:

start cmd /k ""C:\Program Files\AzCopy\azcopy.exe" cp "G:\Backup\UATBackups\*" "https://<storage-account-name>.blob.core.windows.net/test/?sp=rw&st=2024-10-08T15:28:58Z&se=2024-10-08T23:28:58Z&spr=https&sv=2022-11-02&sr=c&sig=<SAS-token>" --recursive=true --block-blob-tier=Cold --overwrite=false"

But this gives me:

RESPONSE 401: 401 Server failed to authenticate the request. Please refer to the information in the www-authenticate header.
ERROR CODE: NoAuthenticationInformation

Things I Have Checked:

  • The SAS Token is valid and not expired.
  • The VM time is correctly synced.
  • I’m using the same user account to run both the CMD and the batch file.

My Question:

  • Why does the command work perfectly when I run it manually in CMD, but fail with a 403 error when run via a batch file (even using the same user account)?
  • What needs changing and how do I fix this!

Any help or suggestions would be greatly appreciated. Thanks!

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