Glossary

500 Internal Server Error

Definition: An HTTP status code indicating an unexpected condition on the server prevented it from fulfilling the request.

A 500 Internal Server Error is a generic HTTP status code that means something went wrong on the server but the server cannot be more specific about the exact problem. Unlike 4xx errors which are caused by the client, 5xx errors are server-side problems.

Common Causes

  • A bug or unhandled exception in server-side code.
  • Misconfigured server or web application settings.
  • Database connection failure.
  • File permission errors on the server.
  • Corrupted .htaccess file (Apache).
  • Running out of memory or hitting resource limits.

Other 5xx Errors

  • 501 Not Implemented — Server does not support the requested method.
  • 502 Bad Gateway — Upstream server returned an invalid response.
  • 503 Service Unavailable — Server is temporarily overloaded or under maintenance.
  • 504 Gateway Timeout — Upstream server did not respond in time.

Troubleshooting Steps

  • Check the server error logs for the exact exception or stack trace.
  • Reproduce the issue in a development environment.
  • Test with a simplified request to isolate the failing component.
  • Verify database connectivity and configuration files.
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