Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix 'python' Command Not Found in Windows PowerShell
When you type python in Windows PowerShell and see python : The term 'pyth...
Fix Cloudflare SSL Full Strict Error 526
If you see error 526 in your browser when using Cloudflare with SSL set to Full (Strict), it mean...
Git Push Rejected Non Fast Forward: Troubleshooting Checklist
If you see ! [rejected] main -> main (non-fast-forward) when running
How to Fix Cloudflare 521 Error Due to Proxy Issues
If you see a Cloudflare 521 error, the message usually says something like “Web server is down.” ...
Fix Nginx Redirect Loop: Permanent Solutions
You're trying to reach a site, and the browser keeps bouncing between two URLs until it gives...
Topic paths
Quick titles
How to Fix Nginx Configuration Test Failed ErrorStep-by-Step Guide for 0x800f081f Windows UpdateChrome Sync Disabled on School Chromebook: What to DoTroubleshooting Docker Volume Permission Denied in WordPressFix ERR_CONNECTION_RESET After Chrome UpdateFix Permission Denied When Running Script in VS Code TerminalTroubleshooting Nginx Upstream Connection RefusedTroubleshooting Cloudflare Error 525 Full Strict