Fix: AWS S3 AccessDenied
Simulate the call with IAM Policy Simulator
S3 AccessDenied is usually an IAM policy, a bucket policy block, or a missing `s3:GetObject` on the exact object path (not just the bucket).
Frequently Asked Questions
What causes AWS S3 AccessDenied?
S3 AccessDenied is usually an IAM policy, a bucket policy block, or a missing `s3:GetObject` on the exact object path (not just the bucket).
How to fix AWS S3 AccessDenied?
Check the caller's IAM role for `s3:GetObject` on `arn:aws:s3:::bucket/*`. Then review bucket policy, Block Public Access, and KMS key permissions if the object is encrypted.
Example fix from Kintify Fix
Input: S3 GetObject returns AccessDenied from my Lambda
Output: Check the caller's IAM role for `s3:GetObject` on `arn:aws:s3:::bucket/*`. Then review bucket policy, Block Public Access, and KMS key permissions if the object is encrypted.
Used by developers debugging real production systems