Cannot download file over https behind firewall ?

Question

I have a program to download files :
public class TestServlet
     public static void main(String args[]){
    Authenticator.setDefault(new AuthImpl());
     if (args.length!=2){
      System.out.println("Proper Usage: java -Dhttp.proxyHost=172.21.32.166 -Dhttp.proxyPort=80 TestServlet RemoteFileURL LocalFileName");
       System.out.println("Usage Example:java -Dhttp.proxyHost=199.67.138.83 -Dhttp.proxyPort=8080 TestServlet https://url.com/csv/file.zip file.zip");
      System.exit(0);
     DataOutputStream out=null;
     FileOutputStream fOut=null;
     try
      trustAllHttpsCertificates();
      String urlStr = args[0];
          HostnameVerifier hv = new HostnameVerifier() {
               public boolean verify(String urlHostName, SSLSession session) {
                    System.out.println("Warning: URL Host: "+urlHostName+" vs. "+session.getPeerHost());
                    return true;
         HttpsURLConnection.setDefaultHostnameVerifier(hv);
          System.out.println("\nConnecting to Website . . . "+urlStr);
          URL url = new URL(urlStr == null ? "https://url/Downloads/WC.csv" : urlStr);
          System.out.println("\nConnecting . . . . ");
          BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
          System.out.println(". . . Connected");
          System.out.print("\nDownloading the file . . . ");
          int buff;
          fOut=new FileOutputStream(args[1]);
          System.out.print(" . .");
          out=new DataOutputStream(fOut);
          System.out.print(" . .");
          while ((buff = in.read()) != -1) {
            fOut.write(buff);
          in.close();
        System.out.println(" . . . Done \n");
      catch (Exception e) {
            e.printStackTrace();
       finally {
          try{
               fOut.flush();
               fOut.close();
               System.exit(0);
           catch(Exception e){
               e.printStackTrace();
    HostnameVerifier hv = new HostnameVerifier()
        public boolean verify(String urlHostName, SSLSession session) {
            //System.out.println("Warning: URL Host: " + urlHostName + " vs. " + session.getPeerHost());
            return true;
    private static void trustAllHttpsCertificates() throws Exception
         //  Create a trust manager that does not validate certificate chains:
        javax.net.ssl.TrustManager[] trustAllCerts =  new javax.net.ssl.TrustManager[1];
        javax.net.ssl.TrustManager tm = new miTM();
        trustAllCerts[0] = tm;
          javax.net.ssl.SSLContext sc = javax.net.ssl.SSLContext.getInstance("SSL");
        sc.init(null, trustAllCerts, null);
        javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
    public static class miTM implements javax.net.ssl.TrustManager, javax.net.ssl.X509TrustManager {
        public java.security.cert.X509Certificate[] getAcceptedIssuers() {
            return null;
        public boolean isServerTrusted(java.security.cert.X509Certificate[] certs) {
            return true;
        public boolean isClientTrusted(java.security.cert.X509Certificate[] certs) {
            return true;
        public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType)
                throws java.security.cert.CertificateException {
            return;
        public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType)
                throws java.security.cert.CertificateException {
            return;
   public static class AuthImpl extends Authenticator {
   protected PasswordAuthentication getPasswordAuthentication() {
      String username = new String("guest");
String password = new String ("guest");
       return new PasswordAuthentication(username, password.toCharArray());
}This program works fine for downloading files, over both http and https from my home. When I run this on my desktop in the office it can download files over http, but cannot download https files.
When I try to download files over https, I get the foll. exception:
java.net.UnknownHostException: www.site.com
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:153)
at java.net.Socket.connect(Socket.java:452)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(DashoA12275)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.<init>(DashoA12275)
at com.sun.net.ssl.internal.ssl.SSLSocketFactoryImpl.createSocket(DashoA12275)
at sun.net.www.protocol.https.HttpsClient.doConnect(DashoA12275)
There are 2 differences here, one being that my office desktop sits behind a firewall and there is a proxy in between.
In the office I run the program as :
java -Dhttp.proxyHost -Dhttp.proxyPort TestServlet URL [filename]
eg.:
java -Dhttp.proxyHost=235.67.138.84 -Dhttp.proxyPort=8080 TestServlet https://site.com/portal/Downloads/file.csv file.csv
This url requires authentication, the userid and pwd are hardcoded in the code.
Now, my problem is I cannot understand why this error would come. Is it because of the firewall or because of the proxy ?
Why is it that I can download over http successfully from my office desktop? If the problem is with the firewall or proxy, then even http protocol urls should give the same problem.
Please help.
Vinay
Message was edited by:
vinay_dsouza
Message was edited by:
vinay_dsouza

Answer 1

If you are using HTTPS you should be setting
https.proxyHost
https.proxyPortnot the http.* ones.