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

Fixing Cloudflare 521 Error After Server Restart

You restart your server, wait for it to come back up, then visit your site—only to see a Cloudfla...

How to Fix Nginx Redirect Loop Infinite Redirect

If you see a browser error like "ERR_TOO_MANY_REDIRECTS" or "redirect loop", Ngin...

Fix 'port already allocated' Error in Docker Compose

You run docker compose up and see port is already allocated. This means...

Cloudflare SSL Full Strict Setup Guide

If you enable Cloudflare's SSL/TLS encryption and set it to Full (Strict), y...

Fix 'package.json Not Found' After Cloning a Repository

Symptom

You clone a repository from GitHub (or another remote), change into the directory...

Fixing NGINX Upstream Connection Refused SSL Errors

When NGINX logs upstream connection refused for an SSL backend, it usually means the...