The remote server returned an error: (530) not logged in.

List<string> Files = new List<string>();

            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(new Uri(host + "/" + remoteFile));
            request.Method = WebRequestMethods.Ftp.ListDirectory;

            request.Credentials = new NetworkCredential("Adminstrator", "password@123"); 

            request.UseBinary = false;
            request.UsePassive = true;

            FtpWebResponse response = (FtpWebResponse)request.GetResponse();

            Stream responseStream = response.GetResponseStream(); //ERROR IS HERE
            StreamReader reader = new StreamReader(localFile);
            string CurrentLine = reader.ReadLine();
            while (!string.IsNullOrEmpty(CurrentLine))
            {
                Files.Add(CurrentLine);
                CurrentLine = reader.ReadLine();
            }
            reader.Close();
            response.Close();