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Home / performance-tuning / Fixing Cloudflare SSL Full Strict Sync Issues - Fix Nginx 502 Bad Gateway: Upstream Connection Refused-Resolve Node Version Incompatibility with npm Packages

Fixing Cloudflare SSL Full Strict Sync Issues - Fix Nginx 502 Bad Gateway: Upstream Connection Refused-Resolve Node Version Incompatibility with npm Packages

2026-07-28 06:20:10performance-tuning
Fixing Cloudflare SSL Full Strict Sync Issues - Fix Nginx 502 Bad Gateway: Upstream Connection Refused-Resolve Node Version Incompatibility with npm Packages

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.

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