Raymond Ops

Aug 14, 2026 · Operations

How to Diagnose and Fix 502, 504, and Connection Reset Errors in Nginx

This guide explains the distinct causes of 502 Bad Gateway, 504 Gateway Timeout, and Connection Reset errors in Nginx reverse‑proxy setups and provides a step‑by‑step, four‑segment troubleshooting workflow with concrete log examples, shell commands, and configuration recommendations.