I get error messages when trying to access a bucket

Reviewed on March 24, 2025

Before you start

To complete the actions presented below, you must have:

• Owner status or IAM permissions allowing you to perform actions in the intended Organization

Problem

One of the following messages display when trying to access your bucket using Scaleway Object Storage:

• Failed to preprocess target Error: S3 error: Access Denied
• Error: Shared memory connection was closed.
• Failed to upload disk 'shadowSpec>'
• Agent failed to process method {DataTransfer.SyncDisk}.

Cause

The application cannot access the Object Storage resource.

Solution

If you encounter one or several of the error messages above:

• Check for issues with your API key by following this procedure.

• Make sure that you have the ObjectStorageFullAccess IAM permission.

• Make sure that there is no bucket policy preventing the application to access your bucket.

Going further

• If you did not manage to identify the error and solve it by yourself, open a support ticket, and provide as many details as possible, along with the necessary information below:
  • Object Storage Endpoint (e.g. s3.fr-par.scw.cloud)
  • Bucket name
  • Object name (if the request concerns an object)
  • Request type (PUT, GET, etc.)
  • HTTP status code
  • Date and time (timestamp)
  • User-agent (SDK, client, console, etc.)
  • Transaction ID (if possible)
  • Log / trace of the error (if possible)