C#, why doesn't it hook a WebSocket connection?

Question

C++ / C#

Good!
There is a js client that accepts WebSocket connections:

var socket = new WebSocket("ws://127.0.0.1:8005");
// ... и так далее, обработка сообщений

I have a server in C#

namespace SocketTcpServer
{
    class Program

    {
        public static async Task SendTicksRequest()
        {
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11;
            var ws = new ClientWebSocket();
            var uri = new Uri("ws:127.0.0.1:8005");

            await ws.ConnectAsync(uri, CancellationToken.None);

            var reqAsBytes = Encoding.GetEncoding(1251).GetBytes("{\"ticks\":\"R_100\"}");
            Console.WriteLine(reqAsBytes);
            var ticksRequest = new ArraySegment<byte>(reqAsBytes);

            await ws.SendAsync(ticksRequest,
                WebSocketMessageType.Text,
                true,
                CancellationToken.None);

            var buffer = new ArraySegment<byte>(new byte[1024]);
            var result = await ws.ReceiveAsync(buffer, CancellationToken.None);

            string response = Encoding.GetEncoding(1251).GetString(buffer.Array, 0, result.Count);
            Console.WriteLine(response);
        }

        static void Main(string[] args)
        {
            SendTicksRequest();
            Console.ReadLine();
        }
    }
}

The connection is not established. What am I doing wrong?
PS Implementation through ASP.NET, please do not offer