Accessing html pages through proxy needs Proxy authorization

[prabhusub]

Hi,
I am accessing web pages from my java program,
I have specified the required details, but It doesn't work...
I have specified the below :
System.getProperties().put("proxySet", "true");
System.getProperties().put("http.proxyHost","1.2.3.4");
System.getProperties().put("http.proxyPort","80");
Also set the Autorization details as below :
String authString = "user assword";
String auth = "Basic " + new BASE64Encoder().encode(authString.getBytes());
conn.setRequestProperty("Proxy-Authorization", auth);
But when i try to access pages, I get the html displaying
:
HTTP Error 407
407 Proxy Authentication Required
Even after providing the correct user id and password..
While accessing through IE, I need to give the domain of the user,
in IE 4.0 user : <domain name>\<user name>
pass : <password>
Do I have to specify the domain name in the Authorization details, if so, how do I do that.