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

How to Fix UFW Firewall Port Not Open in Ubuntu

You've configured UFW to allow a port (e.g., 8080) but connections still fail. The port appears c...

Fix Windows Security DNS Error Using Command Prompt

If you see a DNS error in Windows Security (like "DNS server not responding" or "DNS resolution f...

Fix Windows Security Slow Performance After Update

If Windows Security (formerly Windows Defender) feels sluggish or unresponsive after a recent upd...

Fix Windows Search Token Expired Error 0x80090016

If you see the error “Windows Search Token Expired” with code 0x80090016, it usually means the se...

Fix Maven Dependency Resolution Failed in IntelliJ

Fix Windows Security Auto Start Registry Settings

If Windows Security (formerly Windows Defender) isn't starting automatically when you boot your P...