What is a 500 Internal Server Error? Causes & Fixes

Definition

A 500 Internal Server Error is an HTTP status code that indicates something went wrong on the server while processing a request, but the server cannot be more specific about the problem. Unlike a 404, which says the page doesn't exist, a 500 says the server tried but failed to deliver it.

Common causes

• Application bugs — unhandled exceptions in the application code.
• Database errors — connection timeouts, query failures, exhausted connection pools.
• Misconfigured server — broken .htaccess, syntax errors in nginx/Apache configs.
• Memory or PHP/Node limits exceeded by a single request.
• Third-party API failures bubbling up as unhandled errors.

SEO impact

• Repeated 500s on the same URL cause Google to crawl less frequently and eventually drop the page from the index.
• Site-wide 500s during a Googlebot crawl can hurt overall rankings and indexing health.
• Server logs and monitoring tools should alert on 5xx spikes — they signal real problems users are also hitting.

500 errors are server-side and require developer attention — they will not resolve themselves. Scan your site to identify which URLs are returning 5xx responses, then check application logs for the root cause.