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How to Fix Windows Defender Proxy Error - Brave Sync Stuck on Connecting: Step-by-Step Fix-Troubleshoot 504 Gateway Timeout in Windows Security App

Updated 2026-06-13 14:24:04browser-issues
How to Fix Windows Defender Proxy Error - Brave Sync Stuck on Connecting: Step-by-Step Fix-Troubleshoot 504 Gateway Timeout in Windows Security App
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.