我尝试做一个C#程序，监听TCP隧道，以便通过TLS接收安全信息。我已经按照通常的方式用OpenSSL创建了一对certificate.crt和private.key文件，以便从我的C#程序导入X509Certificate2。
我的C#程序：

using System.Net;
using System.Net.Security;
using System.Net.Sockets;
using System.Reflection;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using KeysExchange;
class Program
{
    static void Main(string[] args)
    {
        
        // Load the SSL certificate
        // Load the server certificate from an embedded resource
        string certFilePath = "/etc/ssl/private/certificate.crt";
        string skFilePath = "/etc/ssl/private/private.key";
        // Load the certificate with the associated private key
        X509Certificate2 serverCertificate = new X509Certificate2(certFilePath);
        int port = 443;
        IPAddress ipAddress = IPAddress.Parse("... my local IP");

        if (serverCertificate != null)
        {
            TcpListener listener = new TcpListener(ipAddress, port);
            listener.Start();

            Console.WriteLine("SSL listener started...");

            while (true)
            {
                var client = listener.AcceptTcpClient();
                Console.WriteLine($"[TCP] Listening on port: {port}, ipaddr: {ipAddress}. Client availability:" +
                    $"{client.Available}");

                // Wrap the stream with an SSL stream
                SslStream sslStream = new SslStream(client.GetStream(), false);
                try
                {
                    // Authenticate the SSL connection with the private key password
                    sslStream.AuthenticateAsServer(serverCertificate, false, SslProtocols.Tls12, true);

                    // Read the incoming message
                    using (StreamReader reader = new StreamReader(sslStream))
                    {
                        var message = reader.ReadLine();
                        Console.WriteLine($"Received message: {message}");

                        
                    }

                    // Close the SSL stream and the client connection
                    sslStream.Close();
                    client.Close();
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"Error: {ex.Message}");
                    client.Close();
                }
            }
        }

        Console.ReadLine();
    }

}

问题是当我启动.NET程序时，显示以下输出：

SSL listener started...
[TCP] Listening on port: 443, ipaddr: (...). Client availability:165
Error: The server mode SSL must use a certificate with the associated private key.

我的服务器运行在Ubuntu 20.04上，这是一个远程虚拟服务器，其中密钥已在/etc/ssl/private位置创建。有人知道为什么我的C#程序对该证书没有响应吗？我尝试了几种解决方案，例如将我的自签名证书添加到CA证书，并查看以下命令是否会产生相同的输出：

openssl x509 -noout -modulus -in certificate.crt | openssl md5
openssl rsa -noout -modulus -in private.key | openssl md5

而且很明显两种情况都收到了相同的输出。我有点绝望，我真的不知道出了什么问题。