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

UFW Allow Port Range Not Opening: Fixes and Checks

If you've added a UFW rule to allow a range of ports but connections are still being blocked, the...

How to Fix Command Prompt Not Opening in Windows 10

If you click the Command Prompt shortcut and nothing happens, or it flashes and closes, you're no...

Fix Windows Defender Error 0x80073b01

If you see error code 0x80073b01 when opening Windows Defender or trying to run a scan, it usuall...

How to Fix '404 Not Found' File Path Errors in CMD

How to Fix Windows Activation SSL Certificate Error

If you see an error like "SSL certificate problem" or "There was a problem with the activation se...

Fix Java JDK Not Recognized in Windows 10

You've installed the Java Development Kit (JDK) on Windows 10, but when you type java -vers...