Windows Defender 502 Bad Gateway: Troubleshooting Checklist
If you see a 502 Bad Gateway error when opening Windows Security or trying to update Windows Defe...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesHow to Fix Windows 'Permission Denied' Errors
You try to open a file, run a program, or save a document, and Windows stops you with a 'Permissi...
Fix OneDrive Sync Port Already Allocated Error
If you see "Port already allocated" when starting OneDrive sync, it usually means another process...
Fix Windows Search Not Showing Results Due to Permission Errors
You type a query into the Start menu or File Explorer search box, but no results appear—or only p...
Fix Task Scheduler 'File Locked' Errors When Tasks Don't Run
You set up a scheduled task in Windows Task Scheduler, but it never runs. When you check the hist...
Microsoft Store Troubleshoot Tool: How to Fix Common Issues
If you're having trouble downloading, updating, or launching apps from the Microsoft Store, the b...
Issue queue
SitemapCommand Prompt Stuck at Loading: Troubleshooting Guide
Command Prompt Access Denied Error Windows 10 Solutions
Fix Chrome 'Permission Denied' for Notifications on Windows/Mac/Android
npm ERESOLVE Conflict Resolution Checklist
Windows Security on Mac: Troubleshooting Guide
Chrome Sync Not Loading Extensions: Solutions
Windows Security Scan Not Working? Try These Fixes
How to Fix BitLocker Proxy Permission Denied Error
Windows Security Migration Checklist for IT Admins
Reset Microsoft Store Cache: Step-by-Step
How to Fix Antivirus Port Already Allocated Error
Task Scheduler Broken After Offline Setup? Here's the Fix
Command Prompt Access Denied Error Windows 10 Solutions
Fix Chrome 'Permission Denied' for Notifications on Windows/Mac/Android
npm ERESOLVE Conflict Resolution Checklist
Windows Security on Mac: Troubleshooting Guide
Chrome Sync Not Loading Extensions: Solutions
Windows Security Scan Not Working? Try These Fixes
How to Fix BitLocker Proxy Permission Denied Error
Windows Security Migration Checklist for IT Admins
Reset Microsoft Store Cache: Step-by-Step
How to Fix Antivirus Port Already Allocated Error
Task Scheduler Broken After Offline Setup? Here's the Fix