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

Chrome Certificate Error: Not Secure Site Workaround

You're trying to reach a site and Chrome shows a full-page warning: “Your connection is not p...

How to Fix Nginx Upstream Connection Refused on Port 80

When nginx logs show "upstream connection refused" while connecting to port 80, it means ...

Bluetooth Troubleshooting Checklist for Windows 11

Bluetooth on Windows 11 can be unreliable. If your device won't pair, keeps dropping, or does...

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 Nginx Configuration Test Failed Error

When you run nginx -t and see "test failed", it means nginx found a problem ...

Fix Discord Black Screen from Chrome Hardware Acceleration

Why Chrome Hardware Acceleration Causes Discord Black Screen

When Chrome uses hardware a...