Knowledge base for software setup, errors, and daily tool work.

Fix Cloudflare Origin Certificate with Let's Encrypt

If your origin server is rejecting the Cloudflare origin certificate—perhaps because of a SAN mis...

Fix Nginx Redirect Loop: Permanent Solutions

You're trying to reach a site, and the browser keeps bouncing between two URLs until it gives...

Fix Windows Security App Not Opening Command Prompt

You click the Windows Security icon or try to launch it from Settings, but nothing happens. Or pe...

How to Fix Node Version Mismatch in a Project

You cloned a project, ran npm install, and got errors about engine incompatibility. ...

Docker Container Exits Immediately After Start: Network Fixes

You start a Docker container and it exits right away. The container logs show no errors, or the e...

Docker Compose .env File Not Loading: Common Fixes