Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

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

ER...

Fix Nginx Upstream Connection Refused Socket Error
When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Docker Network Not Found: Troubleshooting Checklist
When Docker complains network not found, containers can't start or connect. This...

Fix Firefox Secure Connection Failed After Update
After a Firefox update, you might see a "Secure Connection Failed" error when visiting we...

Fix Git Push Rejected Due to Unrelated Histories
You try to push a local branch to a remote repository, but Git refuses with a message like ...

Fix Nginx 502 Bad Gateway on Docker Ubuntu
You're running Nginx as a reverse proxy inside Docker on Ubuntu, and suddenly you see