Fix Windows Defender Proxy Error 0x80070422
If you see error 0x80070422 when opening Windows Defender or running a scan, it usually means the...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix 'Permission Denied' Error on Windows Update Log File
When you try to open the Windows Update log file (usually %windir%\WindowsUpdate.log...
Fix Windows Defender High Memory Usage in Windows 11
You open Task Manager and see Windows Defender (Microsoft Defender Antivirus) using 500 MB or mor...
Fix Windows Activation Offline Installer Not Detecting Key
You've downloaded the offline installer for Windows activation, but it keeps saying it can't dete...
Fix Windows Search Authentication Failed in Outlook Sync
When Outlook syncs, it uses Windows Search to index emails. If Windows Search authentication fail...
Fixing Microsoft Store Dependency Conflicts with Windows Features
You try to install or update an app from the Microsoft Store, and you get an error about a depend...
Topic paths
Quick titles
Fix Windows Search Connection Refused Due to FirewallTroubleshooting Windows Security DNS Not WorkingWindows Defender Network Error Checklist: Step by StepFix Windows Update Connection Errors: ChecklistTroubleshooting slui.exe Not Responding in WindowsRemote Desktop Token Expired: Step-by-Step FixWindows Defender Authentication Failed: Step-by-Step FixTroubleshoot Windows Security Missing Path Error