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 listHow to Fix Chrome ERR_TUNNEL_CONNECTION_FAILED
You're browsing in Chrome, and suddenly a page fails to load with the error ERR_TUNNEL_CO...
Fix Windows Activation Server 504 Timeout Error
You try to activate Windows and get an error: "Windows activation server not responding 504 timeo...
Fix Access Denied Errors When Opening Windows Terminal Log Files
You try to open a Windows Terminal log file and get 'access denied'. This happens when the termin...
OneDrive Sync Proxy Error: Troubleshooting Checklist
If you see 'Proxy error' or 'Cannot sync' in OneDrive while connected through a corporate or home...
Fix Windows Terminal Login Loop Error (Exit Code 1)
You open Windows Terminal, see a flash of a login prompt, then it closes immediately with an erro...
Topic paths
Quick titles
Fix Microsoft Store Login Failed: ChecklistFix Windows Defender After Update: Step-by-StepHow to Fix Windows Defender Setup When Version Mismatch OccursFix Windows Search by Resetting ConfigurationPowerShell Sync Issue Troubleshooting StepsHow to Reactivate Windows Without a Product KeyHow to Resolve Outlook Component ConflictsFix Windows Update Error 0x8024402c