---
title: "503 Service Unavailable in AWS S3"
canonical: "https://lemwatch.com/http-status-codes/503/in-aws-s3"
platform: "AWS S3"
last_verified: "2026-08-11"
source: "https://lemwatch.com"
---

# HTTP 503 Service Unavailable in AWS S3

**Platform** — Amazon S3 — object storage, often fronting a static site or CDN.

**Where it surfaces** — S3 access logs, CloudFront distribution logs, or the browser response headers (`x-amz-request-id`).

## Cause on this platform

S3 request rate exceeded per-prefix limits (3,500 PUT / 5,500 GET per prefix per second).

## Fix on this platform

Shard object key prefixes and use exponential backoff; the AWS SDK does this automatically if you enable retries.


## Generic reference

The server is temporarily unable to handle the request — used for planned maintenance, overload, or rate limiting. Implies the server will recover.

_Canonical HTML page: https://lemwatch.com/http-status-codes/503/in-aws-s3_