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After running a script to upload files to an S3 bucket, you receive an 'Access Denied' error. What is the most probable cause?

medium📝 Debug Q6 of 15
AWS - S3 Fundamentals
After running a script to upload files to an S3 bucket, you receive an 'Access Denied' error. What is the most probable cause?
AThe S3 bucket is full and cannot accept more files
BThe IAM user or role lacks the necessary S3 permissions
CThe file size exceeds the maximum allowed by S3
DThe AWS CLI version is outdated
Step-by-Step Solution
Solution:
  1. Step 1: Analyze the error

    An 'Access Denied' error typically indicates permission issues.
  2. Step 2: Check permissions

    The IAM user or role must have explicit permissions to upload to the target bucket.
  3. Step 3: Evaluate other options

    S3 buckets do not have size limits that cause denial, file size limits are large, and CLI version issues usually cause different errors.
  4. Final Answer:

    The IAM user or role lacks the necessary S3 permissions -> Option B
  5. Quick Check:

    Access Denied usually means permission problems [OK]
Quick Trick: Access Denied = missing or insufficient permissions [OK]
Common Mistakes:
MISTAKES
  • Assuming bucket size limits cause Access Denied
  • Blaming file size without checking permissions
  • Ignoring IAM policies and roles

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