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How to Fix Cloudflare 521 Error with Firewall Settings - How to Fix Unverified Breakpoints in VSCode-Windows Security Not Opening on Windows 10: Step-by-Step Fix

Updated 2026-07-28 09:29:03browser-issues
How to Fix Cloudflare 521 Error with Firewall Settings - How to Fix Unverified Breakpoints in VSCode-Windows Security Not Opening on Windows 10: Step-by-Step Fix
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.

More repair notes

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