Set Public networks profile to private

firewall.ps1

$NLMType = [Type]::GetTypeFromCLSID(‘DCB00C01-570F-4A9B-8D69-199FDBA5723B’)
$INetworkListManager = [Activator]::CreateInstance($NLMType)

$NLM_ENUM_NETWORK_CONNECTED  = 1
$NLM_NETWORK_CATEGORY_PUBLIC = 0x00
$NLM_NETWORK_CATEGORY_PRIVATE = 0x01

$INetworks = $INetworkListManager.GetNetworks($NLM_ENUM_NETWORK_CONNECTED)

foreach ($INetwork in $INetworks)
{
    $Category = $INetwork.GetCategory()

    if (!$INetwork.IsConnectedToInternet -and ($Category -eq $NLM_NETWORK_CATEGORY_PUBLIC))
    {
        $INetwork.SetCategory($NLM_NETWORK_CATEGORY_PRIVATE)
    }
}