SSH.Net throws a SSHConnectionException after connection establishin succesfully?

Question

I am trying connect to host machibe with SSH.NET library. Here is my code;

`using(var client new SSHClient(host,port,username,password))
{
  try 
  {
    client.HostReceived += delegate (object sender, HostKeyEventArgs e {e.CanTrust = true;});
    client.Connect()
    if(client.IsConnected)
    {
      var command ="some command";
      var sshcommand = client.RunCommand(command) or SShCommand sshcommand = client.CreateCommand(command); sshcommand.Execute() or client.BeginExecute();
      Console.WriteLine(sshcommand.Result)
   }
   catch (SShConnectionException e)
   {
      Console.WriteLine(e.DisconnectReason);
      Console.WriteLine(e);
   }

}`

I tried SshClient with ConnectionInfo constructor also. Connection is establishing with host machine. However, code is givin SSHConnectonException with messages that ConnectionLost or Connection aborted in the client.RunCommand(command) or SShCommand sshcommand = client.CreateCommand(command); client.Execute() lines. When i try ssscommand.BeginExecute result is null and sshCommand.IsCompleted is false.

What i am missing? Why after succesfull connection, connection is lost in sshcommand?