socket.attach(http, { 'transports': ['polling','websocket'], 'allowUpgrades': true });
socket.attach(https, { 'transports': ['polling','websocket'], 'allowUpgrades': true });
socket.sockets.on('connection', function (socket) {
    // Process stuff here
});

static async Task Connect(string uri)
{
    ClientWebSocket sock = new ClientWebSocket();
    await sock.ConnectAsync(new Uri(uri), CancellationToken.None);
}

System.AggregateException
  HResult=0x80131500
  Message=One or more errors occurred.
  Source=mscorlib
  StackTrace:
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at WebsocketClientTest.Program.Main(String[] args) in C:SourcetestWebsocketClientTestProgram.cs:line 16

Inner Exception 1:
WebSocketException: Unable to connect to the remote server

Inner Exception 2:
WebException: The underlying connection was closed: The connection was closed unexpectedly.