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

Fix Docker Desktop Engine Stopped Hyper-V Error

You open Docker Desktop and see the engine stopped with a Hyper-V error. This often happens after...

How to Fix Windows Update Error 0x80070002 by Resetting Components

If you see error 0x80070002 when trying to run Windows Update, the system often cannot find or re...

Prevent Git Index Lock File Creation: Practical Fixes

If you see fatal: Unable to create 'path/to/.git/index.lock': File exists., ...

Fix Nginx Upstream Connection Refused & Upstream Not Found

When you see upstream connection refused or upstream not found in your ...

Cloudflare Wildcard Subdomain Troubleshooting Checklist

When you set up a wildcard DNS record (e.g., *.example.com) in Cloudflare, subdomain...

Fix Nginx 502 Bad Gateway on Docker Ubuntu