Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

View list

How to Fix Chrome ERR_CONNECTION_RESET with DNS Flush

If Chrome shows ERR_CONNECTION_RESET, the connection was interrupted. This often...

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

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

Troubleshoot Python Virtual Environment Not Working: Practical Fixes

If you've created a Python virtual environment but it isn't activating, packages aren'...

Fix VSCode IntelliSense Not Working for PowerShell

If you're editing PowerShell scripts in VS Code and IntelliSense stops showing suggestions (n...

Fix Git SSL Certificate Verify Failed: Unable to Get Local Issuer

When you see fatal: unable to access '...': SSL certificate problem: unable to get ...

Fixing Nginx 502 Bad Gateway in Docker WordPress Setups
If you're running WordPress in Docker behind an Nginx reverse proxy, a 502 Bad Gateway error ...