请先查看我的Windows表单代码：

        using System;
        using System.Collections.Generic;
        using System.ComponentModel;
        using System.Data;
        using System.Drawing;
        using System.Linq;
        using System.Text;
        using System.Windows.Forms;

        namespace my_prog
        {
            public partial class Form1 : Form
            {
                public Form1()
                {
                    InitializeComponent();
                }
                string ftp_username = "goodzilla_user";
                string ftp_password = "goodzilla_pass";
                string ftp_remote_host = @"ftp://11.11.111.11";

                private void Form1_Load(object sender, EventArgs e)
                {
                    UploadFile("d:\\test.txt", ftp_remote_host + @"/test.txt", ftp_username, ftp_password);
                }

                #region UploadFile Method

                /// <summary>
                /// Methods to upload file to FTP Server
                /// </summary>
                /// <param name="_FileName">local source file name</param>
                /// <param name="_UploadPath">Upload FTP path including Host name</param>
                /// <param name="_FTPUser">FTP login username</param>
                /// <param name="_FTPPass">FTP login password</param>
                /// 
                public void UploadFile(string _FileName, string _UploadPath, string _FTPUser, string _FTPPass)
                {
                    System.IO.FileInfo _FileInfo = new System.IO.FileInfo(_FileName);

                    // Create FtpWebRequest object from the Uri provided
                    System.Net.FtpWebRequest _FtpWebRequest = (System.Net.FtpWebRequest)System.Net.FtpWebRequest.Create(new Uri(_UploadPath));

                    // Provide the WebPermission Credintials
                    _FtpWebRequest.Credentials = new System.Net.NetworkCredential(_FTPUser, _FTPPass);

                    // By default KeepAlive is true, where the control connection is not closed
                    // after a command is executed.
                    _FtpWebRequest.KeepAlive = false;

                    // set timeout for 20 seconds
                    _FtpWebRequest.Timeout = 20000;

                    // Specify the command to be executed.
                    _FtpWebRequest.Method = System.Net.WebRequestMethods.Ftp.UploadFile;

                    // Specify the data transfer type.
                    _FtpWebRequest.UseBinary = true;

                    // Notify the server about the size of the uploaded file
                    _FtpWebRequest.ContentLength = _FileInfo.Length;

                    // The buffer size is set to 2kb
                    int buffLength = 2048;
                    byte[] buff = new byte[buffLength];

                    // Opens a file stream (System.IO.FileStream) to read the file to be uploaded
                    System.IO.FileStream _FileStream = _FileInfo.OpenRead();

                    try
                    {
                        // Stream to which the file to be upload is written
                        System.IO.Stream _Stream = _FtpWebRequest.GetRequestStream();

                        // Read from the file stream 2kb at a time
                        int contentLen = _FileStream.Read(buff, 0, buffLength);

                        // Till Stream content ends
                        while (contentLen != 0)
                        {
                            // Write Content from the file stream to the FTP Upload Stream
                            _Stream.Write(buff, 0, contentLen);
                            contentLen = _FileStream.Read(buff, 0, buffLength);
                        }

                        // Close the file stream and the Request Stream
                        _Stream.Close();
                        _Stream.Dispose();
                        _FileStream.Close();
                        _FileStream.Dispose();

                        MessageBox.Show("Done");
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message, "Upload Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }

                #endregion

            }
        }

我正在使用UploadFile方法将数据上传到Windows Server 2008 R2服务器.
.net 4中的这些代码工作完美,我的问题是关于.net 3.5.
在.net 3.5中,我收到此错误：

“The server returned an address in response to the PASV command that
is different than the address to which the FTP connection was made.”

由于以下原因,我不想使用主动模式：

>如您所知,被动模式优于主动模式
连接…
>当我在.net 3.5和
打开代理软件,我得到以下错误：

“The underlying connection was closed: The server committed a protocol
violation.”

但是.net 4的代理软件和被动模式没有问题,由于我的用户,我无法切换到.net 4.
所以我该如何修复.net 3.5中的被动模式错误？
人们在栈中的每个线程中都说：

    _FtpWebRequest.UsePassive = false;    

这不是我的答案！

注意：服务器和客户端的防火墙均已关闭
 
另一个问题是：

是否可以通过代码定义伪模式的端口范围？
我在这个线程中问了这个问题,因为我认为这样做可以修复PASV错误并帮助被动模式更快地完成工作.

编辑：
我在&下找到了线程我想我有第二回信的情况,
ftp-problem
我在服务器中有两个网络适配器,服务器内部每个IP都像192.168.5. & 192.168.5.
但是我的两个公共IP地址不同.
那么,如何通过更改代码或Windows Server 2008-r2 VPS中的某些内容来解决该错误,为什么该错误仅出现在.net 3.5和.net 4中却没有呢？
我拥有对服务器的完全访问权限,并且可以更改所有必要的内容.

提前致谢

解决方法:

这是你的答案：
看来问题与.net 3.5和.net 4没有关系
您可以在服务器内部修复该问题,如下所示
configuring-ftp-firewall-settings-in-iis-7
对于代理软件错误：更改端口范围.
对于被动错误：将防火墙的外部IP地址更改为您的公共IP地址.

编辑：
其他人了解我们是否真的很感激,是否有可能在后面的代码中定义端口范围？