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 listBitLocker 504 Gateway Timeout Checklist
You're trying to unlock a BitLocker-protected drive or escrow a recovery key, but the management ...
Fix Windows Defender Error 502 Bad Gateway
You open Windows Security and see 'Error 502 – Bad Gateway.' This usually means Windows Defender ...
How to Fix Windows Security Blank Screen Issue
When you open Windows Security and see only a blank white or black screen, the app isn't loading ...
Fix Windows Security DNS Error Caused by Antivirus Conflict
You might see a Windows Security alert about a DNS error after installing or updating a third-par...
Outlook Not Receiving Emails After Windows Update – Fixes
After a Windows update, Outlook may stop receiving new emails while still sending or showing old ...
Topic paths
Quick titles
Resolve Proxy Server Issues in Microsoft StoreHow to Fix Windows Activation Key Detection in Offline SetupBitLocker Event Log vs Log File: Key DifferencesEmpty Log File in Windows Terminal: Causes and SolutionsWinSCP Connection Refused vs Permission Denied: How to FixWindows Update Rate Limit Error FixOneDrive SSL Certificate Error FixHow to Fix PowerShell Network Permission Denied