Create another scheduler task for Event ID 15500 in the same way.

1. Set the task name: EnableWiFi_if_Ethernet_Disconnected-15500
2. Configure the task action:
   Command: C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
   Argument: -NoProfile -WindowStyle hidden -ExecutionPolicy Bypass -Command &{Enable-NetAdapter -Name TPLinkWiFi -confirm:$False}

In the properties of both tasks, go to the Conditions tab and uncheck the Start the task only if the computer is on AC Power option.

Now try to connect the LAN cable. After a couple of seconds, your Wi-Fi adapter will be automatically disabled (Status=Dormant).

When Ethernet is disconnected, the task enables the wireless adapter and Windows automatically connects to your saved Wi-Fi network.

Turn Off Wi-Fi on Ethernet Connection Using WLAN Manager PowerShell Script

To automatically disconnect the Wi-Fi adapter when a computer is connected to a wired Ethernet network, you can use the WLAN Manager PowerShell script. You can find a newer WLAN Manager version with enhanced Windows 10 support and correct detection of virtual adapters on GitHub: https://github.com/jchristens/Install-WLANManager.

This PowerShell script will create a new Scheduler task that periodically checks for active network adapters. If the script detects any LAN (Ethernet) connection, the WLAN interface is automatically disabled. If the Ethernet network cable is disconnected, the script enables the wireless Wi-Fi adapter.

The script consists of two files:

• PSModule-WLANManager.psm1
• WLANManager.ps1

You can install WLAN Manager script on Windows. Open the elevated PowerShell prompt and allow to run the PS1 scripts:

Set-ExecutionPolicy RemoteSigned

Install the script on Windows with the following command:

.\WLANManager.ps1 -Install:System

The script may be installed to run as a user account (Install:User) or with a local system account priveleges (Install:System).

Verifying WLAN Manager version information… Missing
Writing WLAN Manager version information… Done
Verify WLAN Manager Files… Missing
Installing WLAN Manager Files… Done
Verify WLAN Manager Scheduled Task… Missing
Installing WLAN Manager Scheduled Task… Done

You can make the script notify a user with a pop-up notification when switching between Wi-Fi and LAN networks:

.\WLANManager.ps1 -Install:User -BalloonTip:$true

Make sure that a new WLAN Manager task has appeared in the Task Scheduler.

Restart your computer. After the startup, the Scheduler will start the C:\Program Files\WLANManager\WLANManager.ps1 script that checks network connections every second, and if a LAN connection is detected, all available Wi-Fi adapters will be disabled. If the LAN cable is disconnected, the script will automatically enable wireless Wi-Fi adapters.

WLAN Manager script works well on Windows 11, 10, 8.1, and 7.

Disable Non-Domain Wireless Networks When Connected to LAN via GPO

There is a separate setting in GPO that allows you to disable the Wi-Fi connections when a computer is connected to a corporate domain network via LAN. This policy is located in the following GPO section Computer Configuration -> Policies ->Administrative Templates -> Network ->Windows Connection Manager and called “Prohibit connection to non-domain networks when connected to domain authenticated network”.

The policy prevents computers from connecting to both a domain network and an untrusted non-domain network at the same time.

However, when this policy is enabled, you may experience problems when connecting to a Wi-Fi network if the additional interfaces are present on your computer. For example, loopback interface or virtual network adapters from desktop hypervisors (VMware Workstation, Hyper-V, VirtualBox, etc.)

You can also disable the use of Wi-Fi if there is an active Ethernet connection to the domain LAN. You can configure this behavior using the GPO option Minimize the number of simultaneous connections to the Internet or a Windows Domain under Computer Configuration -> Administrative Templates -> Network -> Windows Connection Manager. Enable the policy and select 3=Prevent Wi-Fi when on Ethernet.