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How to Fix Cloudflare 521 Error (Port 443 Blocked) - Git index.lock File Exists: Fix Permission Denied-How to Fix Docker Access Denied on Apple Silicon Mac

2026-07-28 15:17:06
How to Fix Cloudflare 521 Error (Port 443 Blocked) - Git index.lock File Exists: Fix Permission Denied-How to Fix Docker Access Denied on Apple Silicon Mac

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.