// C# version

using (Ftp client = new Ftp())
{
    // we will use custom validation
    client.ServerCertificateValidate +=
        new ServerCertificateValidateEventHandler(Validate);

    // Minimalistic version to accept any certificate:
    //client.ServerCertificateValidate += 
    //    (sender, e) => { e.IsValid = true; };

    client.ConnectSSL("ftp.example.org");
    client.Login("username", "password");

    foreach (FtpItem item in client.GetList())
    {
        if (item.IsFolder == true)
            Console.WriteLine("[{0}]", item.Name);
        else
            Console.WriteLine"{0}", item.Name);
    }
    client.Close();
}

private static void ValidateCertificate(
    object sender,
    ServerCertificateValidateEventArgs e)
{
    const SslPolicyErrors ignoredErrors =
        SslPolicyErrors.RemoteCertificateChainErrors |  // self-signed
        SslPolicyErrors.RemoteCertificateNameMismatch;  // name mismatch

    if ((e.SslPolicyErrors & ~ignoredErrors) == SslPolicyErrors.None)
    {
        e.IsValid = true;
        return;
    }
    e.IsValid = false;
}