Checklists for software errors, setup, and tool workflows.

Nginx Upstream Connection Refused: Diagnosis and Fixes

When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...

Fix VS Code Source Control Not Detecting Changes on Windows 11

If you're using VS Code on Windows 11 and the Source Control panel isn't showing your fil...

Fix VS Code Breakpoints Not Hit in Multi-Root Workspace

If you're using a multi-root workspace in VS Code and finding that breakpoints in some folder...

Fix Nginx 'upstream connection refused' When Talking to PHP-FPM

You're seeing upstream connection refused in your Nginx error log, and your site...

How to Fix Cloudflare 521 Error with Firewall Settings

If you see a 521 Web Server Is Down error when visiting your site through Cloudf...

Fix pnpm ERR_PNPM_OUTDATED_LOCKFILE Lockfile Error

When running pnpm install or pnpm update, you may see:

ER...