Checklists for software errors, setup, and tool workflows.

Fix DNS Probe Finished NXDOMAIN on Custom DNS Server

If you see “DNS PROBE FINISHED NXDOMAIN” in Chrome or another browser while using a custom DNS se...

VS Code Git Not Detecting Changes: Step-by-Step Fix

You've edited files in VS Code, but the Source Control panel shows no changes. The git icon m...

How to Fix Cloudflare 521 Error During Setup

If you see a 521 error after setting up Cloudflare, it means your origin server refused the conne...

Fix Firefox Secure Connection Failed on Mac

If you see "Secure Connection Failed" in Firefox on your Mac, the browser is blocking the...

How to Fix Cloudflare 521 Error with Wildcard Subdomains

If you're seeing a Cloudflare 521 error on a wildcard subdomain (e.g., *.example.com), the or...

Git Fatal: Refusing to Merge Unrelated Histories – Workaround

You try to merge two Git branches and get this error:

fatal: refusing to merge unre...