Checklists for software errors, setup, and tool workflows.

Fix Windows Security App Blocked by Antivirus

You open Windows Security (formerly Windows Defender) only to see an error or blank screen becaus...

Fix Nginx 'upstream connection refused' When Talking to PHP-FPM

You're seeing upstream connection refused in your Nginx error log, and your site...

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 Windows Update Error 0x80070002 After Update

After a Windows Update, you may see error 0x80070002. This usually means the system can't fin...

Cloudflare Origin Certificate Setup Checklist

You've set up Cloudflare but your origin server still shows SSL errors or mixed content warni...

Fix npm 'package.json not found' Error in Subdirectories

You're working in a subdirectory of your project, run npm install or npm r...