HttpUrlConnection: Connection timed out: connect

Question

I am seeing a small percentage of my customers who cannot connect to my server through my Java program to download program updates. The commonality between the customers is that all (or most) of them seem to be from Australia, but I have some customers in Australia who CAN connect successfully. Probably a red herring.
The problem is seen when creating a URL connection to a text file to read it. The file contains only 3 lines. Like I said, most users do not have a problem, but some do. Could it be that the connection is actually timing out, and if so, how do I lengthen the timeout? Most users say that they do not even have to wait 5 seconds before the error occurs.
The user can connect to the URL with a browser and download the files that way, but this is supposed to be an automatic process. They tell me there is nothing wrong with their network. I'm wondering whether they might have a firewall in place, but when I block connections using my software firewall, I get java.net.UnknownHostException instead.
The code looks roughly like this. I've added printlns recently and have not heard back from the customer with any results.
        String urlString = cUpdateLocation + cUpdateFileName;
         try {
            System.out.println("Create the URL: " + urlString);
            URL url = new URL(urlString);
            System.out.println("Open the URL connection");
            URLConnection urlConn = url.openConnection();
           System.out.println("Get an input stream");
            InputStream inputStream = urlConn.getInputStream();
            System.out.println("Define an input stream reader");
           InputStreamReader iReader = new InputStreamReader(inputStream);
           System.out.println("Define a buffered reader");
            BufferedReader bReader = new BufferedReader(iReader);
           String input = "";
           System.out.println("Read from the buffered reader");
            try {
                while (input != null) {
                   input = bReader.readLine();
                    if (input != null) {
                        // Ignore blank lines 
                      input.trim();
                        if (input.length() > 0) {
                            System.out.println("input=" + input);
               System.out.println("Done reading from the buffered reader");
                success = true;
            } catch (IOException e) {
               // Catch these IOExceptions here so we can still close the
                // streams and clean up while we have reference to them
.                System.out.println("IOException encountered reading from:\n" +
                                  urlString + "\n" + e);
            bReader.close();
        } catch (MalformedURLException e) {
            System.out.println("URL " + urlString + " is malformed.  " +
                               e.getMessage());
        } catch (IOException e) {
           // This is the exception that I normally see.
            System.out.println("IOException encountered creating stream to " +
                               "read from:\n" + urlString + "\n" + e);
            e.printStackTrace();

Answer 1

Did u write the code to handle Proxy server.?
Though i m not sure but might be clients who are getting error uses proxy server. and other dont have a proxy in their network.
Iu did not handled proxy u can do this by...
Properties sysProperties = System.getProperties();
// Specify proxy settings
sysProperties.put("proxyHost", "your_proxy_host");
sysProperties.put("proxyPort", "your_proxy_port");
sysProperties.put("proxySet", "true");or while running
use
java -D option to set these system properties
hope works
cheers