Ftp URL, j2re1.3.1 versus j2re1.4.1

Hello everybody
I have a client application running on a PC, OS win2k, which regularly uses an ftp URL to download data files from a remote FTP server.
There are two options for this, either through an Ethernet LAN or through slow modem connection (19.2kb) via PPP.
When this application runs under j2re1.3.1 everything is fine in any case.
I recently upgraded to j2re1.4.1, but things changed
1) LAN connection everything is OK as usual
2) Modem connection download a file from root directory, everything still OK.
3) Modem connection, download a file from a subdirectory, i receive an exception sun.net.ftp.FTPProtocolException: PORT
the URL i'm using is
ftp://myuserid:mypassword@serverIP/path/filename
i tried
ftp://myuserid:mypassword@serverIP:21/path/filename
but still throwing same exception as above.
What has changed from 1.3.1 to 1.4.1 concerning URLs or security?
Best Regards
Kostas Bouzianas

It would be useful if you posted a stack trace showing the exact FtpProtocolException that is thrown. From your first post it sounds like the PORT command is failing and if so, then the response string from the ftp server should be include in the exception text. The PORT command issued by the 1.4.x ftp client is identical to the PORT command issued by the 1.3.x implementation but in the 1.4 case PORT will only be used if a passive mode connection fails. In other words, in 1.4 the ftp client first tries a EPSV or PASV command to use a passive mode connection. Is there any possibility that this causes a problem on the embedded device so that a subsequent PORT command fails?

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System.out.println(line);
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String str;
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System.out.println(str);
bufferedReader.close();
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return true;
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BufferedReader bufferedReader = new BufferedReader(new FileReader(filePath));
String str;
while ((str = bufferedReader.readLine()) != null) {
out2.write(str);
out2.flush();
System.out.println(str);
bufferedReader.close();
catch (IOException ex) {
System.out.println(ex.getMessage());
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protected void finalize() {
commandPort.close();
datasPort.close();
}

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}catch(Exception e)
                    e.printStackTrace();
                    System.out.println("*****");
                    e.getMessage();

You could use only Java classes without and 3rd party classes (com.sshtools.j2ssh) for doing this:
     * Upload a file to a FTP server. A FTP URL is generated with the following syntax:
     * <code>ftp://user:password@host:port/filePath;type=i</code>.
     * @param ftpServer FTP server address (incl. optional port ':portNumber').
     * @param user Optional user name to login.
     * @param pwd Optional password for <i>user</i>.
     * @param fileName Destination file name on FTP server (with optional preceeding relative path, e.g. "one/two/three.txt").
     * @param source Source file to upload.
     * @throws MalformedURLException, IOException on error.
    public void upload(String ftpServer, String user, String pwd, String fileName, File source) throws MalformedURLException, IOException {
        if (ftpServer != null && fileName != null && source != null) {
            StringBuffer sb = new StringBuffer("ftp://");
            if (user != null && pwd != null) { //need authentication?
                sb.append(user);
                sb.append(':');
                sb.append(pwd);
                sb.append('@');
            }//else: anonymous access
            sb.append(ftpServer);
            sb.append('/');
            sb.append(fileName);
            sb.append(";type=i"); //a=ASCII mode, i=image (binary) mode, d= file directory listing
            BufferedInputStream bis = null;
            BufferedOutputStream bos = null;
            try {
                URL url = new URL(sb.toString());
                URLConnection urlc = url.openConnection();
                bos = new BufferedOutputStream(urlc.getOutputStream());
                bis = new BufferedInputStream(new FileInputStream(source.getName()));
                int i;
                while ((i = bis.read()) != -1) { //read next byte until end of stream
                    bos.write(i);
                }//next byte
            } finally {
                if (bis != null) try { bis.close(); } catch (IOException ioe) { /* ignore*/ }
                if (bos != null) try { bos.close(); } catch (IOException ioe) { /* ignore*/ }
        }//else: input unavailable
    }//upload()

Ftp URL, j2re1.3.1 versus j2re1.4.1

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