Knowledge base for software setup, errors, and daily tool work.

How to Downgrade Node.js for Package Compatibility

You install a package and get errors like requires Node.js >= 16, but you have 18...

Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome

When Chrome shows 'NET::ERR_CERT_AUTHORITY_INVALID', it means the browser cannot verify t...

Fixing Nginx 502 Bad Gateway in Docker: Practical Steps

You set up Nginx as a reverse proxy in Docker, but instead of your app you see a 502 Bad Gateway....

How to Fix Firefox Secure Connection Failed Malware Warnings

If you see a "Secure Connection Failed" error in Firefox and suspect malware, it's of...

Fix Cloudflare Wildcard Subdomain Not Working with WordPress

You set up a wildcard DNS record in Cloudflare (e.g., *.example.com) expecting all subdomains to ...

Fix Nginx Upstream Connection Refused Socket Error