Checklists for software errors, setup, and tool workflows.

How to Fix Cloudflare Error 521: Origin Server Unreachable

If you see Cloudflare error 521, your origin server is not responding to Cloudflare's request...

Windows Update Error 0x800f081f: Troubleshooting Steps

You're running Windows Update and it fails with error 0x800f081f. This usually means the upda...

Fix Nginx Redirect Loop After SSL Certificate Install

You installed an SSL certificate, and now your site redirects in a loop. The browser shows 'E...

Fix Docker Nginx 502 Bad Gateway After Restart

After restarting your Docker containers, you might see a 502 Bad Gateway error when accessing you...

Fix Git Clone Connection Timed Out Due to Firewall

You run git clone and after a long pause see connection timed out. This...

Fix 'package.json Not Found' After Cloning a Repository

Symptom

You clone a repository from GitHub (or another remote), change into the directory...