Connect to ssh-j.com by code

Hi, I try to write program for test to use ssh-j.com in my application

bug targetClient.Connect(); go timeout why ?

class Program
{
static void Main()
{
string path = System.IO.Directory.GetCurrentDirectory();
Console.WriteLine("Benvenuto nella simulazione di una shell SSH. Digita 'exit' per uscire.");
Console.WriteLine("Percorso corrente:" + path);
string jumpHost = "ssh-j.com";
string jumpUsername = "foo";
string jumpPassword = "";
string targetUsername = "paolob";
string targetPrivateKeyPath = "id_rsa"; // Percorso alla chiave privata del server di destinazione
PrivateKeyFile targetPrivateKey = new PrivateKeyFile(targetPrivateKeyPath);
using (SshClient jumpClient = new SshClient(jumpHost, jumpUsername, jumpPassword))
{
jumpClient.Connect();

         var jumpForwardedPort = new ForwardedPortDynamic("127.0.0.1", 22);
        jumpClient.AddForwardedPort(jumpForwardedPort);
        jumpForwardedPort.Start();

        PrivateKeyAuthenticationMethod am = new PrivateKeyAuthenticationMethod(targetUsername, targetPrivateKey);
        var connectionInfo = new ConnectionInfo(jumpForwardedPort.BoundHost, (int)jumpForwardedPort.BoundPort, targetUsername, am);

        using (SshClient targetClient = new SshClient(connectionInfo))
        {
            targetClient.Connect();

Start with the sample's jumpClient.Connect(), ForwardedPortDynamic setup, and targetClient.Connect() entry points. Reproduce the timeout with the supplied connection details and determine whether the issue can be isolated to the reported SSH.NET behavior; the report does not name a repository file or test, so completion would require a confirmed cause and a focused reproduction.