Even though you have put pretty strong security on the wireless network, in some cases it helps if you still wants to completely lock down certain computers from accessing it. Unfortunately, there is no easy tool built-in Windows that can easily do that for you. You will have to go through the cool command line to make it happen. And this time, we will use netshcommand line from the Command Prompt window.

Let’s say we want to block a computer from accessing a wireless network SSID "home". Here is what we can do:

First, open Dos Prompt window as Administrator on the machine you want to block the access. 

(Click start - Run - Cmd )

Then, use the following command to block the access.

netsh wlan add filter permission=block ssid=home

After that, you can use

netsh wlan show filter

to double check if the setting is taken in place.

Furthermore, if you want to block this computer from accessing all wireless network, simply use denyall option in the command.

netsh wlan add filter permission=denyall networktype=adhoc

That’s it. Isn’t that hard?