Hi @Evans,
Please refer to the Microsoft documentation for simultaneous connections.
Minimize simultaneous connections
This policy is configured using the fMinimizeConnections Group Policy. It is on by default for Windows 8, Windows 8.1, and Windows 10.
Versions of Windows before Windows 10, version 1809, build 17763.404
In Windows 8, Windows 8.1, and versions of Windows 10 before Windows 10, version 1809, build 17763.404, this policy is a boolean value that can be modified using either Group Policy or the WcmSetProperty API.
If this policy is disabled, the behavior is similar to that for Windows 7 in which each interface connects to the most preferred network in range, regardless of the connectivity state of other interfaces.
If this policy is enabled, Windows attempts to maintain the smallest number of concurrent connections that offer the best available level of connectivity. Windows maintains connectivity to the following networks:
- Any Ethernet network
- Any networks that were manually connected during the current user session
- The most preferred connection to the Internet
- The most preferred connection to the Active Directory domain, if the PC is joined to a domain
All remaining networks are soft-disconnected, as described in the next section. This is also used to evaluate available networks that are not connected. Windows will not connect to a new network from which it would immediately soft-disconnect.
Windows 10, version 1809, build 17763.404 and later
In Windows 10, version 1809, build 17763.404, and later, this value is an enumeration that is only available through Group Policy.
This policy setting determines if a computer can have multiple connections to the Internet, to a Windows domain, or to both. If multiple connections are allowed, the policy then determines how network traffic is routed.
If this policy is set to 0, a computer can have simultaneous connections to the Internet, to a Windows domain, or to both. Internet traffic can be routed over any connection, including a cellular connection or any metered network. This was previously the Disabled state for this policy setting in builds of Windows before Windows 10, version 1809, build 17663.404. This option was first available in Windows 8.
If this policy is set to 1, any new automatic Internet connection is blocked when the computer has at least one active Internet connection to a preferred type of network. The order of preference is as follows:
- Ethernet
- WLAN
- Cellular
Ethernet is always preferred when connected. Users can still manually connect to any network. This was previously the Enabled state for this policy setting in builds of Windows before Windows 10, version 1809, build 17763.404. This option was first available in Windows 8.
If this policy setting is set to 2, the behavior is similar to when it is set to 1. However, if a cellular data connection is available, that connection will always stay connected for services that require a cellular connection. When the user is connected to a WLAN or Ethernet connection, no Internet traffic is routed over the cellular connection. This option was first available in Windows 10, version 1703.
If this policy setting is set to 3, the behavior is similar to when it is set to 2. However, if there is an Ethernet connection, Windows does not permit users to connect to a WLAN manually. A WLAN can only be connected (automatically or manually) when there is no Ethernet connection.
Registry Editior Option:
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WcmSvc\GroupPolicy
Value Name: fMinimizeConnections
Group Policy Editor Option:
Computer Configuration -> Administrative Templates -> Network -> Windows Connection Manager -> “Minimize the number of simultaneous connections to the Internet or a Windows Domain” = Disabled
