WebSocket Server is causing the error message below every 5 seconds

[akramire]

[9/9/2023 4:37:00 AM] DEBUG <>c__DisplayClass66_0.b__0:791

System.IO.IOException: Authentication failed because the remote party has closed the transport stream.
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest, Boolean renegotiation)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
at WebSocketSharp.Net.WebSockets.TcpListenerWebSocketContext..ctor(TcpClient tcpClient, String protocol, Boolean secure, ServerSslConfiguration sslConfig, Logger log) in D:\WebSocketSharp\websocket-sharp\websocket-sharp\Net\WebSockets\TcpListenerWebSocketContext.cs:line 93
at WebSocketSharp.Server.WebSocketServer.<>c__DisplayClass66_0.b__0(Object state) in D:\WebSocketSharp\websocket-sharp\websocket-sharp\Server\WebSocketServer.cs:line 791

[akramire]

Adding more information about the issue.
As soon as the service starts every 5 seconds the error message happens.

This is the source code.

using System;
using System.Configuration;
using System.Security.Cryptography.X509Certificates;
using WebSocketSharp;
using WebSocketSharp.Server;

namespace Example2
{
public class Program
{
public static void Main (string[] args)
{
// Create a new instance of the WebSocketServer class.
//
// If you would like to provide the secure connection, you should
// create a new instance with the 'secure' parameter set to true or
// with a wss scheme WebSocket URL.
int puerto = int.Parse(ConfigurationManager.AppSettings["Puerto"]);
var wssv = new WebSocketServer (puerto,true);

#if DEBUG
// To change the logging level.
wssv.Log.Level = LogLevel.Trace;
wssv.Log.File = @"C:\log\TraceProtocol.log";
#endif
// To provide the secure connection.

        var cert = ConfigurationManager.AppSettings["ServerCertFile"];
        var passwd = ConfigurationManager.AppSettings["CertFilePassword"];
        wssv.SslConfiguration.ServerCertificate = new X509Certificate2(cert, passwd);
        wssv.SslConfiguration.EnabledSslProtocols = System.Security.Authentication.SslProtocols.Tls12;
        wssv.SslConfiguration.CheckCertificateRevocation = false;
        wssv.SslConfiguration.ClientCertificateRequired = false;
        wssv.SslConfiguration.ClientCertificateValidationCallback = null;
        

      
        // Add the WebSocket services.
        wssv.AddWebSocketService<Echo> ("/Echo");
        wssv.AddWebSocketService<Chat> ("/Chat");

 

  wssv.Start ();

  if (wssv.IsListening) {
    Console.WriteLine ("Listening on port {0}, and providing WebSocket services:", wssv.Port);

    foreach (var path in wssv.WebSocketServices.Paths)
      Console.WriteLine ("- {0}", path);
  }

  Console.WriteLine ("\nPress Enter key to stop the server...");
  Console.ReadLine ();

  wssv.Stop ();
}

}
}