Overview

Error code 300504 is a media upload error that Amazon sellers may encounter when listing products or updating images on Seller Central. This error indicates that Amazon's servers were unable to retrieve media from the URL you provided because the hosting server took too long to respond. Understanding this error and knowing how to resolve it quickly can prevent delays in getting your product listings live.

Key Points / What Sellers Need to Know

• HTTP 504 Gateway Timeout — This error is triggered when Amazon receives a 504 status code while attempting to fetch your media file from an external URL, meaning the server hosting your image or video did not respond in time.
• Multiple Retry Attempts — Amazon's systems automatically retry the media retrieval several times before returning this error, so if you see it, the issue is likely persistent rather than a momentary glitch.
• Server-Side Issue — The root cause is almost always on the media hosting server's end, not within Seller Central itself, which means sellers need to investigate their own hosting infrastructure or the third-party service where their media is stored.
• Listing Delays — Until this error is resolved, the affected media will not appear on your product listing, potentially impacting conversion rates and customer experience.

What Causes This Error

The 300504 error occurs when Amazon's servers act as a gateway to fetch media from a URL you have specified, but the upstream server hosting that media fails to respond within the allowed timeframe. This is a standard HTTP 504 Gateway Timeout scenario applied to Amazon's media ingestion pipeline. Common causes include an overloaded media hosting server, network routing issues between Amazon's infrastructure and your server, or overly aggressive timeout settings on the hosting side. If your media is hosted on a shared server or a budget hosting plan, resource limitations during peak traffic periods can also trigger this timeout.

How to Fix It

Start by verifying that the media URL you provided is correct and that the file is publicly accessible — you can test this by pasting the URL directly into a browser to confirm the image or video loads without requiring authentication. Next, check that your media server is properly following HTTP protocol standards and returning the correct response codes. Investigate the network connection between your hosting server and the broader internet for any connectivity issues, packet loss, or DNS resolution problems. Finally, consider increasing the timeout duration on your media server configuration so that it allows more time for requests to be processed before timing out. If you are using a CDN or cloud storage service, review its settings to ensure there are no rate limits or access restrictions blocking Amazon's retrieval requests.