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Fix Cloudflare 521 Error: DNS Configuration Problem - How to Fix Git Push Rejected Non-Fast-Forward Upstream-Resolve Docker Mount Permission Denied macOS

Updated 2026-07-28 17:22:44macos-help
Fix Cloudflare 521 Error: DNS Configuration Problem - How to Fix Git Push Rejected Non-Fast-Forward Upstream-Resolve Docker Mount Permission Denied macOS
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.

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