Fix Nginx Upstream Connection Refused Socket Error
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 venv Not Activating in VS Code Terminal
When you create a Python virtual environment but it doesn't activate in the VS Code terminal,...
Windows Explorer Keeps Restarting in Windows 11: Fixes
If Windows Explorer keeps restarting on your Windows 11 PC, you'll see the taskbar and deskto...
Fix Angular Breakpoints Not Hit in VS Code
You set a breakpoint in an Angular component or service, start debugging in VS Code, and the brea...
How to Fix Git Unrelated Histories Error When Merging Branches
You try to merge two branches, and Git stops with: fatal: refusing to merge unrelated histo...
Fix npm run build Failed with PostCSS Error
You run npm run build and see a PostCSS error. This often happens after updating pac...
Topic paths
Quick titles
Nginx Configuration Test Failed: Duplicate Listen FixHow to Fix npm Install Permission Denied on MacTroubleshooting npm Permission Errors in VS CodeMicrosoft Edge Sync Reset GuideHow to Fix Cloudflare 521 Error with Firewall SettingsHow to Enable Windows Defender Real-Time Protection in Windows 10Chrome Certificate Authority Invalid on Corporate Network FixGit Large File Push Fixes and Best Practices