
utObject' permission for the target S3 bucket, or a condition in the IAM policy is being met that denies the action.
utObject' permission or a denying condition, is the most likely cause. Option A (time sync) typically manifests as 'SignatureDoesNotMatch' or similar, not necessarily 'Authentication failed' directly, though it can contribute. Option C (IP restriction) would also result in 403 Forbidden but the specific 'Authentication failed' in firewall logs points more to IAM/policy. Option D (incorrect host/path) would likely result in connection errors or different HTTP error codes like 404 or host not found.
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