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

Fix Windows Activation Stuck on 'Activating'

You see 'Activating' in Settings > System > Activation, but it never finishes. This is a common g...

Fix Outlook Email Sync Failed on Ubuntu

Outlook email sync fails on Ubuntu: what to check

If Outlook (via web browser, Evolution,...

Nginx 502 Bad Gateway: A Practical Troubleshooting Guide

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

Fix Gradle Build: Could Not Find or Load Main Class

When a Gradle build fails with Could not find or load main class, it usually means t...

Fix Chrome 502 Bad Gateway Error When Using a VPN

You're browsing with a VPN active, and Chrome suddenly shows a 502 Bad Gateway e...

Fix a Corrupted Windows Terminal Configuration File

Windows Terminal stores its settings in a JSON file. If that file gets corrupted—often after a cr...