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

Reduce Command Prompt Memory Usage: Practical Steps

If you notice the Command Prompt (cmd.exe) consuming more memory than expected—sometimes hundreds...

Fix Windows Terminal 504 Gateway Timeout with Nginx

If you see a 504 Gateway Timeout error in Windows Terminal while accessing a ser...

How to Clear SSH Known Hosts and Fix Host Key Verification Failed

Certbot Renew Certificate Troubleshooting: Common Fixes

When your SSL certificate is about to expire, you run certbot renew and get an error...

How to Fix DNS Probe Finished NXDOMAIN Error in Chrome

When you see "DNS probe finished NXDOMAIN" in Chrome, it means the browser can't find the website...

Fix Microsoft Store Error 0x80073cf3 After Update

If you see error 0x80073cf3 when opening the Microsoft Store after a Windows update, the store ap...