Fix ERR_CERT_AUTHORITY_INVALID in Chrome
When Chrome shows ERR_CERT_AUTHORITY_INVALID, it means the browser cannot verify...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix Windows Defender Sync Issues with Microsoft Account
If you've signed into Windows with your Microsoft account and notice that Defender settings—like ...
Fix Microsoft Store 504 Timeout When Downloading Apps
You're trying to download an app from the Microsoft Store, but it fails with a 504 timeout error....
PowerShell ISE vs Console: Troubleshooting Guide
If you've ever run a script in the PowerShell Integrated Scripting Environment (ISE) only to find...
Fix Chrome Proxy Server Not Responding for a Profile
If Chrome shows 'proxy server not responding' only when you're using a particular profile, the pr...
Fix 'UFW Status Shows Port Not Active' Error
You run sudo ufw status and see a rule for a port, but the port isn't actually activ...
Issue queue
SitemapPowerShell Freezes on Launch: Troubleshooting Guide
Fix 7-Zip 'Cannot Open File' Error When Repairing Archives
Maven dependency resolution failed after adding new dependency
Microsoft Store DNS Error: How to Fix After Update
Fix Windows Activation SSL Certificate Error
Troubleshooting Windows Certificate Error 0x800b0109
Ubuntu apt update Lock File Removal Guide
How to Install SSL Certificate for Remote Desktop
How to Fix OneDrive Login Loop Not Working
Troubleshoot Windows Terminal Settings Not Saving
How to Make Scheduled Tasks Run Despite UAC
Fix 'Command Not Found' When Setting Up Windows Update via Command Line
Fix 7-Zip 'Cannot Open File' Error When Repairing Archives
Maven dependency resolution failed after adding new dependency
Microsoft Store DNS Error: How to Fix After Update
Fix Windows Activation SSL Certificate Error
Troubleshooting Windows Certificate Error 0x800b0109
Ubuntu apt update Lock File Removal Guide
How to Install SSL Certificate for Remote Desktop
How to Fix OneDrive Login Loop Not Working
Troubleshoot Windows Terminal Settings Not Saving
How to Make Scheduled Tasks Run Despite UAC
Fix 'Command Not Found' When Setting Up Windows Update via Command Line