Checklists for software errors, setup, and tool workflows.

Fix Docker Nginx 502 Bad Gateway with MySQL

You have a Dockerized web app behind Nginx, and you're seeing a 502 Bad Gateway error. The ap...

Git Clone Connection Timed Out: Troubleshooting Checklist

When you run git clone and get a connection timed out error, the cl...

How to Set Up a Wildcard Subdomain DNS Record in Cloudflare

If you need all subdomains (e.g., *.example.com) to point to the same IP or service, a wildcard D...

Cloudflare Origin Certificate Troubleshooting Steps

If your website shows SSL errors or users see "This site can’t provide a secure connection,&#...

How to Fix Nginx Redirect Loop with Cloudflare

You set up Cloudflare for your site, and now visitors see a redirect loop error. The page keeps r...

Checklist for Troubleshooting Nginx Permission Denied Errors

Understanding the Problem

When Nginx returns a 403 Forbidden or logs an error like ...