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

Cloudflare DNS Not Propagating for Subdomain: Fixes

You added a subdomain record in Cloudflare DNS, but it still resolves to the old IP or nothing at...

How to Fix Nginx Upstream Connection Refused Error

If you're seeing upstream connection refused in your Nginx error logs, it usuall...

Windows 11 Wi-Fi Connected but No Internet: Step-by-Step Fix

You're connected to Wi-Fi, but websites won't load and apps show no internet. This is a c...

Fix 'git remote origin already exists' Error in GitLab

How to Recover from a Detached HEAD in Git After a Rebase

You're in the middle of a rebase, you see a message like 'detached HEAD', and you'...

How to Fix Git Detached HEAD and Checkout a Branch

You're working in a Git repository, make some commits, and then realize you're in a '...