Fix OneDrive Sync Error 0x8004de40 (SSL Certificate)
If you see error 0x8004de40 when syncing OneDrive, it usually means your computer cannot verify t...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Security Service Stopped Working in Windows 10
If you see a notification that the Windows Security service has stopped working, your antivirus o...
Fix Windows Search After Disabling Cortana
If you've disabled Cortana and find that Windows Search no longer returns results or runs slowly,...
How to Fix Chrome ERR_CONNECTION_TIMEOUT for Profile 504
When Chrome shows a 504 gateway timeout error tied to your profile, it usually means a network re...
Fix Windows Terminal Access Denied When Opening Profile
You click a profile in Windows Terminal and get an 'access denied' error. This usually happens wh...
Windows Security Troubleshooting Guide
Windows Security (formerly Windows Defender) usually runs quietly in the background, but sometime...
Topic paths
Quick titles
Troubleshooting Outlook 404 on Email AttachmentsFix OneDrive Permission Denied Sync ErrorsResolve PowerShell Proxy Connection IssuesFix Cloudflare 525 SSL Handshake Error – ChecklistResolve Windows Defender Authentication Failure from Group PolicyUsing Windows Logs to Fix BitLocker Encryption ErrorsFix WinSCP Permission Denied ErrorsClear DNS Cache to Fix Windows Activation Timeout