Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see connect() failed (111: Connection refused) or connect() failed (13:...

Fix Chrome Certificate Error Due to Antivirus Interference
You're browsing in Chrome and suddenly see a red warning: Your connection is not priv...

Fix Nginx Permission Denied for SSL Certificate Files
When nginx refuses to start or reload with a "permission denied" error related to an SSL ...

Fix Nginx 502 Bad Gateway in Docker Containers
An Nginx 502 Bad Gateway error when proxying to a Docker container usually means Nginx cannot rea...

How to Fix Taskbar Icons Not Loading on Startup
You boot your PC, but the taskbar icons—volume, network, battery, or pinned apps—don't show u...

Checklist for Nginx Configuration Test Failure
When you run nginx -t and get a failure, the server won't reload or restart. Thi...