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Windows 11 WiFi Has Internet but Other Devices Work Fine - Step-by-Step Fix for Windows Update Error 0x800f081f-Fix Windows Defender Real-Time Protection Not Starting

Updated 2026-07-28 15:06:41cloud-software
Windows 11 WiFi Has Internet but Other Devices Work Fine - Step-by-Step Fix for Windows Update Error 0x800f081f-Fix Windows Defender Real-Time Protection Not Starting
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.