Overview

Amazon Seller Central uses a set of 300000 series error codes to communicate problems that occur during feed submissions, listing uploads, and data processing requests. These codes typically indicate server-side or connectivity issues between a seller's system and Amazon's servers. Understanding what each code means can help sellers quickly diagnose upload failures and take corrective action.

Key Points / What Sellers Need to Know

• These errors are system-level, not listing-level — Unlike content validation errors, 300000 series codes indicate problems with the connection or server infrastructure rather than issues with your product data itself.
• Most are transient — The majority of these errors are temporary and will resolve on their own if you retry the submission after a short wait.
• Error codes mirror HTTP status patterns — The last three digits of each code correspond to familiar HTTP response codes, making them easier to interpret if you understand basic web error conventions.
• Retry logic is essential — Sellers who use automated tools or the SP-API should implement retry mechanisms with exponential backoff to handle these errors gracefully.
• Persistent errors require investigation — If the same error occurs repeatedly across multiple retries, it may point to a configuration issue, an expired certificate, or a broader Amazon service disruption.

Error Code Breakdown

The 300000 series includes several distinct codes, each pointing to a different root cause. Error 300060 is a general processing failure that can occur when Amazon's system is unable to handle the submitted feed. Error 300204 indicates that the request was received but returned no content, which may mean the submission was accepted but produced no actionable response. Error 300403 signals an access denied or forbidden response, typically caused by expired credentials, incorrect authentication tokens, or insufficient permissions on the seller account. Error 300404 means the requested resource or endpoint was not found, which can occur when targeting a deprecated or incorrect feed URL.