Nginx Troubleshooting Guides

Nginx errors can surface at the worst possible moments — during deployments, under peak traffic, or in the middle of critical operations. This collection of 4 troubleshooting guides covers the most common Nginx issues encountered in Linux server administration and system operations. Each article walks through specific error messages with step-by-step diagnosis, root cause analysis, and verified solutions. Whether you're dealing with configuration problems, authentication failures, timeout errors, or unexpected behavior, these guides are designed to get you from error message to resolution as quickly as possible. Solutions are backed by official documentation and real-world production experience.

Error Quick Reference

Article	Description
Comprehensive Guide to Fixing Nginx 502 Bad Gateway, 504 Timeouts, and Core Crashes	Diagnose and resolve Nginx 502 Bad Gateway, 504 Timeouts, connection refused errors, out-of-memory crashes, and permission denied issues with this SRE guide.
How to Fix Nginx 502 Bad Gateway, 504 Timeouts, and Connection Refused Errors	Step-by-step guide to troubleshooting Nginx 502 Bad Gateway, 504 Timeouts, connection refused, and OOM crashes. Learn root causes and permanent fixes.
nginx 502 Bad Gateway: Complete Troubleshooting Guide for All Upstream Failures	Fix nginx 502 Bad Gateway, 504, connection refused, crash, and OOM errors with step-by-step diagnosis commands. Restore your upstream in minutes.
Resolving "502 Bad Gateway" in Nginx: Comprehensive Troubleshooting Guide	Fix the Nginx 502 Bad Gateway error. Learn to diagnose upstream failures (PHP-FPM, Gunicorn, Node), reverse proxy timeouts, and permission denied issues.