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 listFix 'Windows Defender Command Not Found Access Denied'
You type MpCmdRun.exe -Scan -ScanType 2 or another Defender command in Command Promp...
Fix Nginx Permission Denied for Logs Directory
When Nginx reports "permission denied" for its logs directory, the server may fail to start or st...
Fix Windows Defender High CPU Usage When Scan Stuck
If Windows Defender is using nearly 100% CPU and a scan appears stuck (e.g., progress bar frozen ...
Fix Windows Terminal Network Error 0x80070035
When you see error code 0x80070035 in Windows Terminal, it usually means the network path was not...
Fix Windows Activation Error 0x8007232b: Authentication Failed
You see "Windows activation authentication failed" with error code 0x8007232b. This usually means...
Topic paths
Quick titles
Resolve Microsoft Store Timeout Errors After Windows UpdateWindows Update Connection Refused? Try Netsh Winsock ResetSetup Windows Defender to Fix DNS ErrorsMicrosoft Store Won't Open? Error 0x80073cf0 FixWindows Terminal Setup Guide with PowerShellHow to Free Allocated Ports for Microsoft StoreResolve Windows Security Version Mismatch and Permission DeniedTroubleshoot Windows Activation Error 0x8007007b