Learn how to a build a cloud-first strategyRegister Now

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1007
  • Last Modified:

FTP through proxy

I'm trying to ftp (using Suns nonstandard ftp class) through our proxy server and I've been able to get through it and can "cd" etc.
The problem comes when it actually comes to 'get'ing the file.

I consistantly get the following exception.
++++++
Exception in thread "main" sun.net.ftp.FtpProtocolException: RETR drop.sql
        at sun.net.ftp.FtpClient.openDataConnection(FtpClient.java:224)
        at sun.net.ftp.FtpClient.get(FtpClient.java:315)
        at maltest.main(maltest.java:30)
++++++++

The file exists and is owned by the logged in owner.
Any ideas?

My java source is below...

Cheers,

Mal

++++++++


import java.io.*;
import java.net.*;
import java.util.*;
import sun.net.ftp.FtpClient;

public class maltest {

    public static void main(String args[]) throws Exception {

    String host = "mydomain.co.uk";
    String path = "/home/drop.sql";
    String username = "user";
    String password = "password";

    int lastSlash = path.lastIndexOf('/');
    String filename = path.substring(lastSlash+1);
    String directory = path.substring(0,lastSlash);

    System.getProperties().put( "ftpProxySet", "true" );
    System.getProperties().put( "ftpProxyHost", "172.16.2.77" );
    System.getProperties().put( "ftpProxyPort", "8000" );

    FtpClient client = new FtpClient(host);
    client.login(username, password);
    client.ascii();
    client.cd(directory);
    client.cd(directory);


    InputStream is = client.get(filename);
    BufferedInputStream bis = new BufferedInputStream(is);

    OutputStream os = new FileOutputStream(filename);
    BufferedOutputStream bos = new BufferedOutputStream(os);

    byte[] buffer = new byte[1024];
    int readCount;

    System.out.println("Getting: " + filename);
                   
    while( (readCount = bis.read(buffer)) > 0) {
      bos.write(buffer, 0, readCount);
    }
    bos.close();
    System.out.println("done!");

//    client.closeServer();
 

    }

}
0
malcx
Asked:
malcx
  • 2
1 Solution
 
lawpanCommented:
I believe that when the file is sent the FTP server opens a socket to you, trying on port 20. But in that case it tries to connects to your proxy.
You must set your client as PASSIVE. I dont really remember the command or flag for setting you in passive mode.
0
 
malcxAuthor Commented:
Thanks but there doesnt seem to be much documentation for this - any idea where I can find this info?

Cheers,

Mal
0
 
malcxAuthor Commented:
Cheers for the comment, but I've changed to use an ftp class from:
http://www.enterprisedt.com/downloads/ftp.html

which works fine by just setting the proxy details as before,

once again thanks anyway,
Mal
0
 
MoondancerCommented:
I have refunded your 100 points to you for this and will close it by moving it to the PAQ, so that the participating expert can be advised, versus deleting it where no further content can be viewed.

Thanks,

Moondancer
Community Support Moderator @ Experts Exchange
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now