我正试图从ftp服务器下载一个文件。filezilla已成功下载该文件。但是java应用程序给出错误“425控制和数据连接的ip地址不匹配”。
禁用地址匹配验证不起作用。我在用apachecommonsnet图书馆。远程服务器运行在nat后面，本地服务器运行在代理后面。
我怎样才能解决这个问题？

package javaappftptest;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Proxy.Type;
import java.net.SocketAddress;

import org.apache.commons.net.PrintCommandListener;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPSClient;
import org.apache.commons.net.util.TrustManagerUtils;

public class JavaAppFtpTest {

    public static void main(String[] args) {
        String server = "<ftpsHostIP>"; //hostname or hostIP
        int port = 990;                 //port ftps
        String user = "<ftpLogin>";     
        String pass = "<ftpPassword>";

        String proxyHost = "<proxyIP>"; //Local proxy params
        int proxyPort = <proxyPort>;
        Type typeProxy = Type.HTTP;

        int reply;
        FTPSClient ftpClient = new FTPSClient(true);  //create the ftps client (implicit ftps)

        try {

            SocketAddress addr = new InetSocketAddress(proxyHost,proxyPort); //set proxy params to the client
            Proxy proxy = new Proxy(typeProxy,addr);
            ftpClient.setProxy(proxy);

            ftpClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out),true)); //Add protocol listener for logging of commands

            ftpClient.setTrustManager(TrustManagerUtils.getAcceptAllTrustManager());
            ftpClient.setControlKeepAliveTimeout(10000L);
            ftpClient.setDataTimeout(30000);

            System.out.println("Try connect to host " + server + " port " + port);

            ftpClient.connect(server,port);             // connecting to ftps server

            ftpClient.execPBSZ(0);                      // set buffer size (unlimit)
            ftpClient.execPROT("P");                    // set protected mode P
            reply = ftpClient.getReplyCode();
            System.out.println("ReplyCode = " + reply);

            ftpClient.login(user, pass);                // login to server
            reply = ftpClient.getReplyCode();
            System.out.println("ReplyCode = " + reply);

            String remoteDir = "/201014";                   
            ftpClient.changeWorkingDirectory(remoteDir);    // change remote dir on server
            reply = ftpClient.getReplyCode();
            System.out.println("ReplyCode = " + reply);

            ftpClient.printWorkingDirectory();
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);    // set file type (image = binary type)
            reply = ftpClient.getReplyCode();
            System.out.println("ReplyCode = " + reply);

            ftpClient.enterLocalPassiveMode();              // set passive mode

            String remoteFile1 = "img22103106251_3.jpg";
            File downloadFile1 = new File("img22103106251_3.jpg");

            ftpClient.setRemoteVerificationEnabled(false);  //disable verification of matching command and data addresses
            reply = ftpClient.getReplyCode();
            System.out.println("ReplyCode = " + reply);

            OutputStream outputStream1 = new BufferedOutputStream(new FileOutputStream(downloadFile1));
            boolean success = ftpClient.retrieveFile(remoteFile1, outputStream1);  // download file to local directory

            if (!success) {
                System.out.println("ERROR. File has NOT been downloaded");
            }
           reply = ftpClient.getReplyCode();
            System.out.println("ReplyCode = " + reply);

            outputStream1.close();

            if (success) {
                System.out.println("File has been downloaded successfully.");
            }

        } catch (IOException ex) {
            System.out.println("Error: " + ex.getMessage());
            ex.printStackTrace();
        } finally {
            try {
                if (ftpClient.isConnected()) {
                    ftpClient.logout();
                    ftpClient.disconnect();
                }

            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}

输出：

Try connect to host <ftpHostIP> port 990
220 %Unauthorized access prohibited%
PBSZ 0
200 PBSZ=0
PROT P
200 Protection level set to P
ReplyCode = 200
USER*******
331 Password required for <ftpLogin>
PASS*******
230 Logged on
ReplyCode = 230
CWD /201014
250 CWD successful. "/201014" is current directory.
ReplyCode = 250
PWD
257 "/201014" is current directory.
TYPE I
200 Type set to I
ReplyCode = 200
ReplyCode = 200
PASV
227 Entering Passive Mode (xxx,xx,xx,xx,xxx,xxx)   <-IP matches to the ftpHostIP!
RETR img22103106251_3.jpg
425 Rejected data connection for transfer of "/201014/img22103106251_3.jpg", IP addresses of control and data connection do not match
ERROR. File has NOT been downloaded
ReplyCode = 425
QUIT
221 Goodbye