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How to Fix Cloudflare 521 Error Due to Proxy Issues - Fix Detached HEAD in Git and Switch Branches-Fix Chrome Sync Not Working with Family Link

Updated 2026-07-28 13:26:17windows-fixes
How to Fix Cloudflare 521 Error Due to Proxy Issues - Fix Detached HEAD in Git and Switch Branches-Fix Chrome Sync Not Working with Family Link
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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