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Amazon SES SignatureDoesNotMatch

The request signature does not match the expected signature.

Understanding Amazon SES

Amazon Simple Email Service (SES) is a cloud-based email sending service designed to help digital marketers and application developers send marketing, notification, and transactional emails. It is a reliable, cost-effective service for businesses of all sizes that require a flexible email solution.

Identifying the Symptom: SignatureDoesNotMatch

When using Amazon SES, you might encounter the error message: SignatureDoesNotMatch. This error indicates that the request signature does not match the expected signature, which is crucial for authenticating requests to AWS services.

Exploring the Issue: SignatureDoesNotMatch Error

The SignatureDoesNotMatch error occurs when the signature included in your request does not match the signature AWS calculates. This discrepancy can arise from incorrect AWS credentials, a mismatch in the signing process, or errors in the request parameters.

Common Causes of the Error

  • Incorrect AWS Access Key ID or Secret Access Key.
  • Improperly formatted request or incorrect headers.
  • Time synchronization issues between your system and AWS servers.

Steps to Fix the SignatureDoesNotMatch Error

To resolve the SignatureDoesNotMatch error, follow these steps:

1. Verify AWS Credentials

Ensure that you are using the correct AWS Access Key ID and Secret Access Key. You can manage your credentials in the AWS IAM Console. Make sure the credentials are active and have the necessary permissions.

2. Check Request Formatting

Review your request to ensure it is correctly formatted. Pay attention to the headers and parameters. Use tools like AWS CLI to test and debug your requests.

3. Synchronize System Time

Ensure your system clock is synchronized with a reliable time source. AWS uses time-based signatures, so any significant time drift can cause signature mismatches. Use ntpdate or similar tools to sync your system time.

4. Review Signature Calculation

Double-check the signature calculation process in your code. Refer to the AWS Signature Version 4 Signing Process documentation for guidance on correctly signing your requests.

Conclusion

By following these steps, you should be able to resolve the SignatureDoesNotMatch error in Amazon SES. Ensuring correct credentials, request formatting, and time synchronization are key to successful AWS request authentication.

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