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Fix Docker Compose Environment Variable Default Value Not Used - Fix Nginx Upstream Connection Refused Socket Error-Switching from Cloudflare Origin Certificate to Let's Encrypt

2026-07-28 18:53:54developer-tools
Fix Docker Compose Environment Variable Default Value Not Used - Fix Nginx Upstream Connection Refused Socket Error-Switching from Cloudflare Origin Certificate to Let's Encrypt

Final checklist

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