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Troubleshooting

HTTP errors

500, 503 and 404 errors: what causes them and where to start looking.

4 articles in this topic

  1. 500 Internal Server Error Diagnose a 500 error from the request and the log entry at that same moment before reviewing PHP, .htaccess or permissions depending on the exact message. 2 min · Reviewed 09/2026
  2. 404 error on static files with the correct path Diagnose static files that return 404 by checking the response, logs, path and rewrites before changing permissions or .htaccess. 3 min · Reviewed 09/2026
  3. 503 Service Unavailable error Diagnose a 503 from the response, logs and metrics at the same moment to tell the application, maintenance, a backend or resource limits apart. 5 min · Reviewed 09/2026
  4. Diagnose the 503 Overloaded error in PrestaShop Tell a PrestaShop 1.6 geographic block apart from maintenance mode and a server-generated 503 before changing geolocation. 2 min · Reviewed 09/2026