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

Windows Security App Missing After Update: How to Fix

After a Windows update, you might find the Windows Security app missing from the Start menu or sy...

UFW Deny Port But Still Accessible: Fixes and Checks

You set a UFW deny rule for a specific port, but the port remains accessible from outside. This i...

How to Fix Chrome Token Expired Error 400

You're working in Chrome and suddenly get a 400 error: token expired. This usual...

Fix BitLocker on Mac: Compatible Software Not Working

If you're trying to access a BitLocker-encrypted drive on a Mac and the compatible software isn't...

Fix kubectl apply Forbidden on GKE

Fix Windows Security Error 0x80070643 on Ubuntu Dual Boot

If you see error code 0x80070643 when running Windows Security or Windows Update on a dual-boot s...