How to Fix Windows Activation Connection Refused Error
When you try to activate Windows 10 or 11 and see "connection refused" or "can't connect to activ...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listJupyter Kernel Connection Error: Causes and Fixes
You start a Jupyter notebook, try to run a cell, and see a message like "Kernel error" or "Connec...
How to Start the Windows Update Service When It Stops
If Windows Update isn't working, the first thing to check is whether the Windows Update service i...
Fix Microsoft Teams 404 Not Found Error When Loading Apps
You click an app in Microsoft Teams and see a '404 Not Found' page instead of the app loading. Th...
Fix Microsoft Teams Migration Not Syncing Contacts
After a Microsoft Teams migration, you may notice that contacts aren't syncing from Exchange or O...
How to Fix Windows Security Error 0x80070422
You open Windows Security and get error 0x80070422, or see a message that the app can't start. Th...
Topic paths
Quick titles
Checklist for Setting Up PowerShell Remoting on WindowsResolve Windows Defender Not Opening (Error 404)Fix npm EACCES Permission Denied on macOS/LinuxResolve Remote Desktop Access Denied in Windows Server 2019Chrome 502 Bad Gateway Extension Conflict FixHow to Enable Remote Desktop on Windows 11 HomeUbuntu RDP Port 3389 Not Listening: TroubleshootingFix Windows Activation Service Not Running Error