Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When Docker reports 'no space left on device' or you notice disk usage climbing in ...

Fix ERR_NAME_NOT_RESOLVED DNS Configuration Error
When you see ERR_NAME_NOT_RESOLVED in your browser, it means the DNS lookup for ...

Fix Virtual Environment Not Activating in Terminal
Why Your Virtual Environment Won't Activate
You open a terminal, navigate to your pro...

Docker Compose Port Already Allocated: Checklist
You run docker-compose up and get an error like Error starting userland proxy:...

Fix Git Clone Connection Timed Out Due to Proxy Settings
You run git clone https://github.com/example/repo.git and after a long pause you get...

Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused