zhizhu
Home / developer-tools / Fix Windows Update Error 0x80070643 on Windows 10 - Windows Defender Failed to Start: Manual Malware Check Guide-Windows Update 0x800f0831 Metered Network Fix

Fix Windows Update Error 0x80070643 on Windows 10 - Windows Defender Failed to Start: Manual Malware Check Guide-Windows Update 0x800f0831 Metered Network Fix

Updated 2026-06-13 13:05:50developer-tools
Fix Windows Update Error 0x80070643 on Windows 10 - Windows Defender Failed to Start: Manual Malware Check Guide-Windows Update 0x800f0831 Metered Network 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.

More repair notes

Fix Windows Update Connection Timeout Due to Proxy SettingsHow to Fix Windows Update Error 0x80070002Fix Nginx 404 on All Pages Except IndexFix 'cargo build' Permission Denied on LinuxResolving 'ERESOLVE Unable to Resolve Dependency Tree' in npmChecklist for Windows Update Connection Refused Issues