How to create SslStream for non-blocking async socket

I have a multithreaded async System.Net.Socket

which is listening on a port. I have no problem if I receive a request from HTTP, but recently I had to add support for https to my application.

The client gave me .arm

certification .arm

. It contains Base-64 encoded ASCII data. File name - cert.arm

and it's stored in the root of my solution folder.

Here's what I have been doing so far to use this certificate:

using System;
using System.Net;
using System.Threading;
using System.Net.Security;
using System.Net.Sockets;
using System.Security.Cryptography.X509Certificates;
using System.Text;

namespace SocketExample
{
    public class StackOverFlow
    {
        public static ManualResetEvent _manualResetEvent = new ManualResetEvent(false);
        private static X509Certificate2 _cert = X509Certificate2("..\\..\\cert.arm");

        static void Main(string[] args)
        {
            StartListening();
        }

        private static void StartListening()
        {
            IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any, 9002);

            if (localEndPoint != null)
            {
                Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

                if (listener != null)
                {
                    listener.Bind(localEndPoint);
                    listener.Listen(10);

                    Console.WriteLine("Socket listener is running...");

                    listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);
                }
            }
        }

        private static void AcceptCallback(IAsyncResult ar)
        {
            _manualResetEvent.Set();

            Socket listener = (Socket)ar.AsyncState;

            Socket handler = listener.EndAccept(ar);

            SslStream sslStream = new SslStream(new NetworkStream(handler, false));
            sslStream.AuthenticateAsServer(_cert); // I get exception on this line

            StateObject state = new StateObject();
            state.workSocket = handler;

            handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReceiveCallback), state);

            listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);
        }

        private static void ReceiveCallback(IAsyncResult result)
        {
            StateObject state = (StateObject)result.AsyncState;
            Socket handler = state.workSocket;

            int numBytesReceived = handler.EndReceive(result);

            if (!handler.Connected)
            {
                handler.Close();
                return;
            }

            if (numBytesReceived > 0)
            {
                state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, numBytesReceived));

                string[] lines = state.sb.ToString().Split('\n');

                if (lines[lines.Length - 1] == "EOF")
                {
                    // All Data Received. Do Something.
                }
                else
                {
                    // All Data is not received. Continue reading...
                    handler.BeginReceive(state.buffer, 0, state.buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), state);
                }
            }
        }
    }
}

      

        
        
        
      

    

The certification file has been successfully created. I can see the data in the _cert variable. Everything is good.

The problem is that when I call the method AuthenticateAsServer

I get NotSupportedException

which says "SSL in server mode must use a certificate with the corresponding private key."

How can I apply this certification file to my outlet?