Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If Chrome shows ERR_CONNECTION_RESET when you try to load a page, the connection was...

When you run docker compose up and get an error like port is already allocated...

Git Fatal: Refusing to Merge Unrelated Histories – Workaround
You try to merge two Git branches and get this error:
fatal: refusing to merge unre...

Git Merge Conflict: Keep Both Files Instead of One
When you run git merge and get a conflict, Git stops and marks the conflicting files...

Fix Docker Container Exits Immediately in Background Mode
You run a Docker container with -d (detached mode) and it exits immediately. The con...

How to Fix Nginx Upstream Connection Refused on Port 80
When nginx logs show "upstream connection refused" while connecting to port 80, it means ...