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 listCertbot Renewal Failed Due to Nginx Configuration: How to Fix
You run certbot renew and get an error like “Failed to authenticate” or
How to Fix Git Non-Fast-Forward Push Errors
When you run git push and see an error like ! [rejected] main -> main (non-fas...
How to Fix Command Prompt Not Working in Recovery Mode
If you’ve booted into Windows Recovery Environment (WinRE) to run Command Prompt for repairs, but...
Fix Outlook Access Denied Error When Sending Email
You try to send an email in Outlook but get an 'access denied' message. This usually means Outloo...
Fix Windows Update Error 0x80070002
When Windows Update fails with error 0x80070002, it usually means the update installer can't find...
Topic paths
Quick titles
Reset PowerShell Settings Configuration File: Step-by-Step GuideFix 'git remote add origin repository not found' ErrorFix Remote Desktop 'Failed to Start Permission Denied' ErrorHow to Resolve Windows Security Rate Limit Error 0x80070005Troubleshooting Remote Desktop Permission Denied (NLA)Remote Desktop Version Mismatch: A Practical ChecklistHow to Fix 'Running Scripts Is Disabled' in PowerShell on Windows 11Troubleshoot Windows Defender Missing Path