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Fix Windows Defender Sync Error 504 Gateway Timeout - Cloudflare SSL Full Strict Troubleshooting Guide-Windows Security DNS Permission Denied Fix

Updated 2026-06-13 23:06:20developer-tools
Fix Windows Defender Sync Error 504 Gateway Timeout - Cloudflare SSL Full Strict Troubleshooting Guide-Windows Security DNS Permission Denied 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.