Nginx

Diagnose and resolve Nginx 502 Bad Gateway, 504 Timeouts, connection refused errors, out-of-memory crashes, and permission denied issues with this SRE guide.

Step-by-step guide to troubleshooting Nginx 502 Bad Gateway, 504 Timeouts, connection refused, and OOM crashes. Learn root causes and permanent fixes.

Fix nginx 502 Bad Gateway, 504, connection refused, crash, and OOM errors with step-by-step diagnosis commands. Restore your upstream in minutes.

Fix the Nginx 502 Bad Gateway error. Learn to diagnose upstream failures (PHP-FPM, Gunicorn, Node), reverse proxy timeouts, and permission denied issues.