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Fix Cloudflare Error 521 on Apache Server - Redis Connection Refused: Step-by-Step Fixes-Troubleshooting Cloudflare Full Strict SSL Issues

2026-06-13 14:55:09macos-help
Fix Cloudflare Error 521 on Apache Server - Redis Connection Refused: Step-by-Step Fixes-Troubleshooting Cloudflare Full Strict SSL Issues

Final checklist

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