The following information can help you troubleshoot issues with your Application Load Balancer.
Successful request: Code 200 ✅
Unsuccessfull at client site: 4XX code ❌
- Error 400: Bad Request
- Error 401: Unauthorized
- Error 403: Forbidden
- Error 405: Method not allowed
- Error 408: Request timeout
- Error 413: Payload too large
- Error 414: URI too long
- Error 460: Client close connection
- Error 463: X-Forwarded For header with > 30 IP (Similar to malformed request)
Unsuccessfull at server site: 5XX code ❌
- Error 500: Internal server error would mean some error on the ELB itseft
- Error 501: Not Implemented
- Error 502 : Bad Gateway
- Error 503: Service Unavailable
- Error 504: Gateway timeout, probably an issue within the server
- Error 505: Version not supported
- Error 561: Unauthorized