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How to Fix Cloudflare 521 Error (Port 443 Blocked) - Git Push Rejected: Non-Fast-Forward and Permission Denied Fixes-Fix Windows Security App by Resetting Settings

Updated 2026-07-28 12:25:36browser-issues
How to Fix Cloudflare 521 Error (Port 443 Blocked) - Git Push Rejected: Non-Fast-Forward and Permission Denied Fixes-Fix Windows Security App by Resetting Settings
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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