Fix Nginx Upstream Connection Refused Behind Cloudflare
If you see upstream connection refused in your Nginx error logs while using Cloudfla...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFixing Cloudflare 521 Error After Server Restart
You restart your server, wait for it to come back up, then visit your site—only to see a Cloudfla...
Fix Windows 11 Bluetooth Error 0x00000001
If you see error code 0x00000001 when trying to turn on Bluetooth or pair a device in Windows 11,...
Cloudflare SSL Full Strict Configuration Checklist
If you see 'This website is not available' or a redirect loop after enabling Cloudflare S...
Fix Windows 11 Installation Assistant Stuck at 99% Registry
If the Windows 11 Installation Assistant gets stuck at 99% while processing registry entries, you...
Fix Nginx Upstream Connection Refused Socket Error
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Topic paths
Quick titles
Troubleshooting Nginx 403 Permission DeniedTroubleshoot Nginx SSL Redirect LoopFix RDP Access Denied ErrorHow to Resolve 'Permission Denied' in VS Code Python TerminalFix Package Errors by Downgrading NodeTroubleshooting Chrome Status Access ViolationCloudflare 521 Troubleshooting GuideCloudflare SSL Full Strict Configuration Checklist