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Fix Windows Defender SSL Certificate Error - Troubleshoot Remote Desktop Connection in Windows 11-Resolve Windows Defender Sync Error 504 Gateway Timeout

Updated 2026-06-13 20:14:42browser-issues
Fix Windows Defender SSL Certificate Error - Troubleshoot Remote Desktop Connection in Windows 11-Resolve Windows Defender Sync Error 504 Gateway Timeout
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.