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 listHow to Fix Windows Search DNS Configuration Issues
Windows Search may stop returning results or fail to index network locations if DNS settings are ...
Fix Windows Security Authentication Failed Event ID 4625
If you're seeing Event ID 4625 in Windows Security logs, it means an account failed to log on. Th...
Fix Remote Desktop Auto-Start Not Working on Windows 10
You've set Remote Desktop to start automatically, but after a reboot, it just sits there. The ser...
How to Fix Command Prompt Permission Denied on Windows 11
You open Command Prompt, run a command, and see 'Access Denied' or 'Permission Denied.' This usua...
Fix Windows Defender Connection Refused via Group Policy
If you see a "connection refused" error when trying to open Windows Defender Security Center or r...
Topic paths
Quick titles
Windows 11 Microsoft Store Path Not Found SolutionStop systemd Service from Continuously RestartingHow to Fix Command Prompt Not Opening in Windows 10Fix Command Prompt Crashing on Windows 10/11How to Resolve Chrome Port Already Allocated ErrorMac Equivalent of Run as AdministratorHow to Fix Chrome Cache Permission Denied and Memory LeakFix Windows Update Error 0x80070020: File Locked