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

Fix Nginx Upstream Connection Refused Behind Cloudflare

If you see upstream connection refused in your Nginx error logs while using Cloudfla...

Git Detached HEAD: Practical Checklist and Fixes

You see a message like 'You are in 'detached HEAD' state' when checking out a com...

How to Allow Unrelated Histories in Git Merge

Fixing Nginx 502 Bad Gateway in Docker: Practical Steps

You set up Nginx as a reverse proxy in Docker, but instead of your app you see a 502 Bad Gateway....

How to Enable Windows Defender Real-Time Protection in Windows 10

If Windows Defender real-time protection is off, your PC is more vulnerable to malware. You may s...

Git Merge Unrelated Histories vs Rebase: When and How to Use Each

You've tried to merge two Git branches and got the error: fatal: refusing to merge unre...