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...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listTeams Stuck Loading? Clear Cache to Fix
If Microsoft Teams gets stuck on the loading screen, a corrupted or bloated cache is often the cu...
Fix 'Windows Activation Script Not Working Command Not Found' Error
When you run a Windows activation script (typically a .bat or .ps1 file) and see 'command not fou...
Fix Windows Search Login Loop Error 0x80070520
When you see error 0x80070520 in Windows Search, it usually means the search indexer cannot authe...
Fix Windows Defender Sync Issues Across Devices
Windows Defender syncs security settings and scan history across your devices through your Micros...
Fix Windows Defender Proxy Error: Permission Denied
You try to update Windows Defender or run a scan and get an error like "Permission denied"
Topic paths
Quick titles
Repair BitLocker Stuck at Boot Using Command PromptHow to Fix Chrome and WebDriver Version MismatchFix 'Port Already Allocated' Error on Windows 10 for ChromeWindows Search Permission Denied Group Policy FixRemote Desktop Error Code Dependency Fix GuideFix Windows Activation Error with Command PromptVS Code Python Interpreter Not Showing? Fix ItResolve Chrome Version Mismatch Error