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Troubleshooting Nginx 502 Bad Gateway and 504 Gateway Timeout: Resolving PHP-FPM Socket Exhaustion, Worker Starvation, and FastCGI Buffer Overflows: Sysadmin Runbook

An exhaustive diagnostic runbook for isolating, analyzing, and resolving Nginx 502 and 504 gateway errors, PHP-FPM Unix socket queue exhaustion, pm.max_children worker starvation, and FastCGI buffer overflows on high-traffic cPanel and WordPress environments.

Nov 5, 2026