This tutorial will show you how to configure group policy to turn off WiFi when Ethernet cable is connected on Windows 2012 server.
This will help your computer environment achieve a higher security level.
The domain controller is running Windows 2012 R2.
The domain computers are running Windows 10.
I don't know if it works on domain computers running Windows 7.
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Tutorial - Creating the GPO to turn off WiFi
The following tasks were executed on a domain controller running Windows 2012 R2 with Active directory.
Click on the Start menu, locate and open the Group Policy Management tool.
On the Group Policy Management screen, locate the folder named Group Policy Objects.
Right-click the Group Policy Objects folder and select the New option.
Enter a name for your new policy.
In our example, the new GPO was named: WIFI NETWORK RESTRICTION.
On the Group Policy Management screen, expand the folder named Group Policy Objects.
Right-click your new Group Policy Object and select the Edit option.
On the group policy editor screen, you will be presented to User configurations and Computer configurations.
We will change only the Computer configurations.
We don't need to change any User configuration.
On the group policy editor screen, expand the Computer configuration folder and locate the following item.
Access the folder named Windows connection manager.
On the right, the list of available configuration options will be presented.
Double click the configuration item named: Prohibit connection to non-domain networks when connected to domain authenticated network.
On the configuration item screen, you need to select the Enable option.
To finish the group policy creation you need to close the Group policy editor window.
Only when you close the group policy window, the system will save your configuration.
Tutorial - Applying the Network Restriction GPO
You have finished the creation of the network restriction GPO.
But, you still need to enable the use of your new Group Policy.
On the Group policy management screen, you need to right-click the Organizational Unit desired and select the option to link an existent GPO.
In our example, we are going to link the group policy named WIFI NETWORK RESTRICTION to the root of our domain named TECH.LOCAL.
After applying the GPO you need to wait for 10 or 20 minutes.
During this time the GPO will be replicated to other domain controllers that you might have.
After waiting 20 minutes, you should reboot a user's computer.
During the boot, the computer will get and apply a copy of the new group policy.
To test the configuration, while connected to the cabled network, you should try to connect to a wireless network.
Your computer should automatically block the new connection.
To test the configuration, remove the cable from the network interface and try to connect to a wireless network.
This time, your computer should authorize the new wireless connection.
