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...

Fix Git SSL Certificate Problem: Unable to Get Local Issuer

You run git clone https://example.com/repo.git and get:

fatal: unable to acc...

Fix Nginx 502 Bad Gateway with Docker Multiple Containers

If you run Nginx as a reverse proxy in front of multiple Docker containers, a 502 Bad Gateway err...

Fixing VSCode IntelliSense Not Working for Go

You open a Go project in VSCode, start typing, and get no autocompletions, no hover info, no erro...

Fix Cloudflare Wildcard Subdomain Page Rule Not Working

You set up a wildcard subdomain page rule in Cloudflare—like * .example.com/*—but it...

How to Fix Git Clone Timed Out and Permission Denied Errors

When you run git clone and see errors like timed out or permissio...