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Graph/s3-notification-event-mismatch

Pattern

S3 Notification Event Mismatch

s3-notification-event-mismatch

A recurring event-driven failure where an S3 trigger is configured for the wrong object-upload event type (e.g., POST vs PUT), so the Lambda never fires and downstream logic appears broken.

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Public graph metadata

Updated4/30/2026

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30 linked nodes

AWS Lambda functions using the same Sentry DSN/client key began receiving Sentry rate-limiting errors (HTTP 429).

Error: invalid event kind "decision" — The `chronicle-save` CLI binary (Chronicle 2.0, local Postgres backend). Outcome: Agents following stale docs hit the error mid-flush and have to retry every save with a remapped kind.

When processing a metered billing event in an AWS Lambda (NodeJS), Stripe returns: "Livemode of key does not match mode of account" even though the user is using a test mode key.

the file is remaining in the bucket sometimes with delete markers — when the function runs via the S3 trigger. Tension: If I run the function using the Test button afterwards, it deletes every time. Outcome: I was able to resolve this by using Cloudwatch EventBridge to monitor S3 CreateObject event.

I am using AWS SDK to generate a presigned S3 object URL and sending it as a mail notification. Tension: Even though I am setting the expiration time to 2 days.

Status code: 403, reason phrase: Forbidden — Trying to visit path from S3 path directly gives me the error down below. Tension: I gave my lambda function's role all policies to ReadOnly S3 and DynamoDb. In S3 object ownership is set to ACLs Disabled. All 5 block public access checkboxes are unchecked. Outcome: it is possible that the object being requested does not exist but is still giving an Access Denied error.

aws s3 sync and aws s3 cp fail with MissingContentLength / stream is not seekable errors

This isn't possible with s3 sync — I have an S3 bucket which does not have versioning or lifecycle rules set due to a client decision. Tension: we also want to keep a backup of the files that has been worked on in the last 30 days. Outcome: it would be a perfect use case for S3 bucket Event notifications.

while running an AWS Lambda function. Tension: The data fetching and processing is good, but the function crashes during the file upload step. Outcome: I’ve tried increasing memory allocation and execution time without success.

Old backup objects/versions in an S3 bucket are not being deleted by the lifecycle rule even though the script and visible object listing suggest only the expected recent backups remain.

The HTTP request cannot be executed: The peer resets the connection. — When I try to upload files to S3 from storage via an application deployed on the stand. Tension: Everything is working locally. All files is uploading without errors. Outcome: com.amazonaws.SdkClientException exception.

nothing is getting written to the s3 bucket — trying to use ytdl-core in an AWS lambda function to upload an .mp4 of a youtube video to an S3 bucket. Tension: I cannot get ytdl to create a stream with any data in it. Outcome: Right now nothing is getting pushed to the buffer or the s3 bucket.

I keep encountering a SignatureDoesNotMatch error. — trying to interact with Supabase's storage using the S3 protocol in Golang. Tension: I have followed Supabase's example provided in JavaScript and translated it into Go. Outcome: For anyone else who spends way too much time on this like I did; I had success just using the v4 request signer.

Error: creating CloudTrail Trail: InsufficientS3BucketPolicyException: Incorrect S3 bucket policy is detected for bucket — Everytime I am trying to deploy my terraform code in Spacelift. Tension: Incorrect S3 bucket policy is detected for bucket. Outcome: Could you please help me with this?

understanding the event payload structure passed by EventBridge to my .NET Lambda function — an AWS serverless application using .NET, where I'm configuring a Lambda function to be triggered by S3 events routed through AWS EventBridge. Tension: I'm specifically seeking guidance on understanding the event payload structure passed by EventBridge to my .NET Lambda function and how to process it effectively. Outcome: How can I deserialize and process the event payload within my .NET Lambda function to perform actions based on the S3 event that triggered it?

facing throttling issues (503 errors) — writing to S3, and facing throttling issues (503 errors). Tension: our ingestion service still encounters 503 errors. Outcome: the files are showing right under my bucket at the root level.

HTTPClientError: An HTTP Client raised an unhandled exception: sequence item 0: expected str instance, bytes found — save it into a S3 bucket. Tension: My issue is I have added a python `requests` layer which somehow messed with how Lambda send the object to s3 using https. Outcome: The error is gone if I remove the layer.

The AWS Lambda function is not being triggered when new files are uploaded to an S3 bucket. The configured S3 notification is set to respond to HTTP POST events, but no events occur and the code never runs.

when I test the Lambda function using the S3-put option. Outcome: This is not the expected result.

I can't bring down S3 or a region to test this scenario. — I would like to create a CloudWatch Alarm to raise an alert when S3 replication fails and test that rule. Tension: Is there a way to make S3 replication to my passive region fail in order to trigger the alarm? Outcome: make S3 replication to my passive region fail in order to trigger the alarm?

But how can I get the event data when a file is uploading to the S3 bucket? — testing aws lambda python locally with docker. Tension: I want to test it locally and I need the event data. Outcome: Here how can I get the bucket and key when I'm running the Lembda locally.

Uploading to S3 via a presigned PUT URL does not apply the desired object tags even when the server-side PutObjectCommand includes the Tagging parameter.

You are missing one colon in the S3 resource ARN — BucketPolicy: Type: AWS::S3::BucketPolicy. Tension: Resource: !Join [ '', ['arn:aws:s3::', !Ref S3Bucket, '/*']]. Outcome: Resource: !Join [ '', ['arn:aws:s3:::', !Ref S3Bucket, '/*']].

continuously getting the error: TypeError: Failed To Fetch — I'm using the AWS SDK V3 in my Nextjs application to upload files to s3. Tension: I've previously had this working with no issue but when I changed my secret key on my user today. Outcome: Downgrading to @aws-sdk/client-s3@3.317.0 fixed the issue for me.

it still returns 200 OK — when the object doesn't exist. Tension: where I expect a 404 Not Found error. Outcome: How do I modify my CloudFormation template so that a request for an unknown S3 key results in an HTTP 404 response?

I want to use S3 Lifecycle to remove non-current version object. Tension: There is no rule apply to `hello.tar`. Outcome: The lifecycle rule functioned correctly, but there was an issue with the UI.

Unit tests cannot deterministically simulate S3 upload failure

AmazonS3Exception: The AWS Access Key Id you provided does not exist in our records

Class not found: com.demo.lambda.handlers.DemoHandler: java.lang.ClassNotFoundException — using AWS S3. Outcome: Current classpath: file:/var/task/.

When calling s3.putObject, AWS SDK throws an error stating that the bucket must be addressed using the specified endpoint.

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