unknownHostKey Error

[Anonymous]

I am attempting to port tunnel, if I use the MyUserInfo class provided it works fine, however I need to create the tunnel pragmatically without requesting credentials.  How do I get around the " unknownHostKey" error message.  My code is shown below.

string sshHost = txtSSHHost.Text;
            int sshPort = Convert.ToInt16(txtSSHPort.Text);
            string sshUsername = txtSSHUsername.Text;
            string sshPassword = txtSSHPassword.Text;
            string localHost = txtLocalhost.Text;
            int localPort = Convert.ToInt16(txtLocalPort.Text);
            int remotePort = Convert.ToInt16(txtDestinationPort.Text);
            string ERRORS = "";
            if (ERRORS == "")
            {
                try
                {
                    var jsch = new JSch();
                    Session session = jsch.getSession(sshUsername, sshHost, sshPort);
                    session.setPassword(sshPassword);
                    
                    //UserInfo ui = new MyUserInfo();
                    //session.setUserInfo(ui);
                    session.connect();
                    //unknown host key
                    HostKey hkey = session.getHostKey();
                    jsch.setKnownHosts(hkey.getHost());
                    
                    session.setPortForwardingL(localPort, localHost, remotePort);
                    
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Unable to tunnel ports:\n\n" + ex.Message + "\n" + ex.StackTrace);
                }
            }

[Anonymous]

After much testing I have managed to crack this, I've posted the code here for future people who may come across the same problem.

public partial class Form1 : Form
    {
        bool sshConnected = false;
        Session session;
        public Form1()
        {
            InitializeComponent();
        }
        private void btnTunnelPort_Click(object sender, EventArgs e)
        {
            string sshHost = txtSSHHost.Text;
            int sshPort = Convert.ToInt16(txtSSHPort.Text);
            string sshUsername = txtSSHUsername.Text;
            string sshPassword = txtSSHPassword.Text;
            string localHost = txtLocalhost.Text;
            int localPort = Convert.ToInt16(txtLocalPort.Text);
            int remotePort = Convert.ToInt16(txtDestinationPort.Text);
            string ERRORS = "";
            if (ERRORS == "")
            {
                try
                {
                    var jsch = new JSch();
                    session = jsch.getSession(sshUsername, sshHost, sshPort);                    
                    UserInfo ui = new MyUserInfo();                                                            
                    session.setUserInfo(ui);
                    session.setPassword(sshPassword);
                    session.connect();
                    session.setPortForwardingL(localPort, localHost, remotePort);
                    if (session.isConnected())
                    {
                        sshConnected = true;
                        MessageBox.Show("Connected");
                    }
                    else
                    {
                        sshConnected = false;
                        MessageBox.Show("Can't connect");
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Unable to tunnel ports:\n\n" + ex.Message + "\n" + ex.StackTrace);
                }
            }
        }
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (sshConnected)
            {
                session.disconnect();
            }
        }
    }
    public class MyUserInfo : UserInfo
    {
        private String _passwd;
        public String getPassword()
        {
            return _passwd;
        }
        public bool promptYesNo(String str)
        {
            return true;            
        }
        public String getPassphrase()
        {
            return null;
        }
        public bool promptPassphrase(String message)
        {
            return false;
        }
        public bool promptPassword(String message)
        {
            return true;
        }
        public void showMessage(String message)
        {
            InputForm.ShowMessage(message);
        }
    }