Troubleshooting error response status codes in CloudFront

If CloudFront requests an object from your origin, and the origin returns an HTTP 4xx or 5xx status code, there's a problem with communication between CloudFront and your origin.

This topic also includes troubleshooting steps for these status codes when using Lambda@Edge or CloudFront Functions.

The following topics provide detailed explanations of the potential causes behind these error responses and offers step-by-step guidance on how to diagnose and resolve the underlying issues.

Topics

• HTTP 400 status code (Bad Request)

• HTTP 401 status code (Unauthorized)

• HTTP 403 status code (Permission Denied)

• HTTP 404 status code (Not Found)

• HTTP 405 status code (Method Not Allowed)

• HTTP 412 status code (Precondition Failed)

• HTTP 500 status code (Internal Server Error)

• HTTP 502 status code (Bad Gateway)

• HTTP 503 status code (Service Unavailable)

• HTTP 504 status code (Gateway Timeout)