Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You try to merge two Git branches and get this error:

fatal: refusing to merge unre...

Fixing Nginx Upstream Connection Refused on Port 443
You see "upstream connection refused" in your Nginx error log when proxying requests to p...

Docker Compose Port Already Allocated: How to Fix
You run docker-compose up and see an error like Error: Port 8080 is already al...

Fix Missing Taskbar Icons on a Second Monitor
If you've connected a second monitor and the taskbar icons aren't showing up on it, you&#...

How to Fix Git Merge Unrelated Histories Error
You run git pull or git merge and get:
fatal: refusing to...

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