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

Fix Windows Activation License Expired After Upgrade

After a major Windows upgrade (e.g., from Windows 10 to Windows 11 or a feature update), you may ...

Windows Update Auto Start Troubleshooting Checklist

Windows Update may automatically start at boot or at random times, causing disruptions. This chec...

How to Remove a Host Key from SSH Known Hosts

SSH warns or fails when a remote host's key changes—common after server rebuilds, IP reassignment...

Windows Security App Not Opening After Update: Fixes

After a Windows update, the Security app may refuse to open—clicking the icon does nothing, or it...

How to Fix Abnormal Memory Usage in CMD on Windows

BitLocker 502 Bad Gateway Sync Issue: Practical Fixes

If you're seeing a 502 Bad Gateway error when syncing BitLocker recovery keys or policies, the pr...