Why Error: 403 Forbidden Is Displayed When I Perform Operations on OBS?

Symptom

Message "Error: stat:403" is displayed when I use mox.file.copy_parallel in ModelArts to perform operations on OBS.

Figure 1 Error message

Possible Causes

• ModelArts uses an AK/SK for authentication globally, and the AK/SK has been deleted and recreated.
• You do not have the permission to access OBS buckets.
• The OBS bucket policy is incorrect.

Solution

If you access the OBS bucket using an IAM user account, contact the tenant account to perform the following operations:

• For cause 1, go to the global configuration page and reconfigure the authorization.
• For cause 2, log in to the OBS console, search for the target OBS bucket, and click the bucket name to go to the Overview page. In the left navigation pane, choose Permissions > Bucket ACLs. On the Bucket ACLs page that is displayed, check whether the current account has the read and write permissions. If it does not, contact the bucket owner to grant the permissions.
  Figure 2 Bucket ACLs
  
• For cause 2, log in to the OBS console, search for the target OBS bucket, and click the bucket name to go to the Overview page. In the navigation pane, choose Permissions > Bucket Policy and verify that the current OBS bucket can be accessed by IAM users.

If the fault persists, see for further troubleshooting.