Fix Cloudflare 502 Bad Gateway Errors in WordPress: The Nginx Helper Conflict

Root Cause of 502 Errors Caused by Nginx Helper in Cloudflare + WordPress Architecture and How to Fix It (SEO Optimized English Version) Keywords: Cloudflare 502, WordPress 502 Bad Gateway, Nginx Helper conflict, Cloudflare Worker WordPress, WordPress admin 502, FastCGI Cache Cloudflare 1. Introduction: Why WordPress Admin Shows 502 Bad Gateway Many site owners using Cloudflare CDN + WordPress + Nginx (FastCGI Cache) install the Nginx Helper plugin to automatically clear caches when content is updated. In production, this setup often triggers the following issues: WordPress admin returns 502 Bad Gateway when publishing or updating posts Cloudflare shows long cfEdge …