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

Fix Cloudflare SSL Full Strict Certificate Mismatch Error

If you set Cloudflare SSL/TLS encryption mode to Full (strict) and see a certificate mismatch err...

Setting Up Cloudflare Wildcard Subdomains: A Practical Guide

If you need to route traffic for any subdomain (like *.example.com) to the same server, Cloudflar...

Chrome Memory Not Decreasing After Closing Tabs – Fixes

You close a dozen tabs, but Chrome still eats 2 GB of RAM. This is normal up to a point—Chrome ca...

Nginx Upstream Connection Refused: Diagnosis and Fixes

When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...

Fix npm install Permission Denied on Shared Hosting

How to Fix Nginx Upstream Connection Refused on Port 80

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