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

Git Detached HEAD vs Attached HEAD: What It Means and How to Fix

If you've seen the message "You are in 'detached HEAD' state" while using Git...

Fix Nginx Configuration Test Syntax Errors

When you run nginx -t and see syntax error, the nginx service will ...

Fix DNS Probe Finished NXDOMAIN Not Working on WiFi

If you see "DNS_PROBE_FINISHED_NXDOMAIN" in Chrome while connected to WiFi, your browser ...

Cloudflare DNS Propagation Time: What to Expect and How to Check

After changing DNS records on Cloudflare, you might wonder how long it takes for the changes to t...

Fix Nginx Upstream Connection Refused Socket Error