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

MongoDB Authentication Failed: Setup Guide and Fixes

If you're seeing 'Authentication failed' when trying to connect to MongoDB, you're not alone. Thi...

Command Prompt Setup Guide for Beginners

What is Command Prompt?

Command Prompt is a text-based interface in Windows that lets you...

Fix OneDrive Sync Not Working After macOS Update

After a macOS update, OneDrive may stop syncing files or show error messages like “OneDrive is sy...

How to Fix Nginx 502 Bad Gateway: A Practical Guide

Seeing a 502 Bad Gateway error from Nginx usually means the upstream server (like PHP-FPM, Gunico...

GitLab Runner Configuration for Pending Jobs: A Troubleshooting Guide

You push a commit, the pipeline triggers, but jobs stay pending indefinitely. Th...

UFW Port Closed Despite Allow Rule: Fixes

You've added a UFW allow rule for a port, but a port scan or service test shows the port is still...