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

Certbot Renewal Failed Due to Nginx Configuration: How to Fix

How to Fix Remote Desktop Certificate Errors in Windows 10

You try to connect to a remote PC via Remote Desktop, but instead of the login screen you see a w...

SSH Permission Denied (Publickey) on EC2: Setup Fixes

If you're seeing "Permission denied (publickey)" when trying to SSH into an AWS EC2 instance, the...

How to Fix High Memory Usage from Windows Activation

If you notice your PC running slow and Task Manager shows high memory usage (often 50% or more) w...

Chrome Connection Refused: Step-by-Step Troubleshooting Checklist

Seeing 'ERR_CONNECTION_REFUSED' in Chrome usually means the browser tried to reach a server but g...

Fix pgAdmin 'Unable to Connect to Server' on Port 5432

You open pgAdmin, try to connect to your PostgreSQL server, and see "Unable to connect to...