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AWS SNS KMSNotFound error when using AWS SNS

The specified KMS key does not exist.

Understanding AWS SNS

Amazon Simple Notification Service (SNS) is a fully managed messaging service provided by AWS. It is designed to facilitate the sending of notifications from the cloud, enabling applications to communicate with users or other applications. SNS supports a variety of communication protocols, including HTTP/S, email, SMS, and AWS Lambda, making it a versatile tool for push communication.

Identifying the Symptom: KMSNotFound Error

When working with AWS SNS, you might encounter the KMSNotFound error. This error typically manifests when attempting to publish a message or configure a topic with server-side encryption enabled. The error message indicates that the specified AWS Key Management Service (KMS) key cannot be found.

Common Scenarios

  • Publishing messages to an SNS topic with encryption enabled.
  • Configuring an SNS topic with a non-existent KMS key.

Explaining the KMSNotFound Issue

The KMSNotFound error occurs when the KMS key specified in your SNS configuration does not exist in your AWS account or is not accessible. This can happen if the key has been deleted, the key ID is incorrect, or the key is in a different AWS region.

Root Causes

  • The KMS key ID or ARN is incorrect.
  • The KMS key has been deleted or disabled.
  • The KMS key is in a different AWS region.

Steps to Resolve the KMSNotFound Error

To resolve the KMSNotFound error, follow these steps:

Step 1: Verify the KMS Key Identifier

Ensure that the KMS key ID or ARN specified in your SNS configuration is correct. You can find the correct key ID or ARN in the AWS KMS console:

  • Navigate to the AWS KMS Console.
  • Locate the key you intended to use and confirm its ID or ARN.

Step 2: Check Key Status

Verify that the KMS key is enabled and has not been deleted:

  • In the KMS console, check the status of the key. It should be "Enabled".
  • If the key has been deleted, you will need to create a new key and update your SNS configuration.

Step 3: Confirm the AWS Region

Ensure that the KMS key is in the same AWS region as your SNS topic:

  • Both the SNS topic and the KMS key must reside in the same region.
  • If they are in different regions, either move the SNS topic or create a new KMS key in the correct region.

Conclusion

By following these steps, you should be able to resolve the KMSNotFound error in AWS SNS. Ensuring that your KMS key is correctly configured and accessible is crucial for maintaining secure and efficient communication through SNS. For more information, refer to the AWS SNS Key Management Documentation.

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