SSH.NET: Renci.SshNet.Common.SshConnectionException: An established connection was aborted by the server

I 'm using Rencii package and it used to work however when I do List Directory which has got more than 2000 files, that is where it’s breaking and giving established connection was aborted.

using System;
using System.Collections.Generic;
using System.IO;
using Renci.SshNet;
namespace worship_sync
{
class Program
{
static void Main(string[] args)
{
const string host = "******";
const string username = "****";
const string password = "vagrant";
const string workingdirectory = "*****";
const string uploadfile = #"******";
Console.WriteLine("Creating client and connecting");
using (SftpClient client = new SftpClient(host, 8822, username, password))
{
client.Connect();
Console.WriteLine("Connected to {0}", host);
client.ChangeDirectory(workingdirectory);
Console.WriteLine("Changed directory to {0}", workingdirectory);
var listDirectory = client.ListDirectory(workingdirectory); // ERROR
Console.WriteLine("Listing directory:");
foreach (var fi in listDirectory)
{
Console.WriteLine(" - " + fi.Name);
}   
}
}
}
}

AND I got this error when I am runing my code: Unhandled Exception: Renci.SshNet.Common.SshConnectionException: An established connection was aborted by the server.