HTTPS URL AND PROXY

I ve written a program which tries to establish connection with a https URL.I am using javax.net.ssl.HttpsURLConnection;

Without proxy settings am getting operation time out exception.When i try to use proxy am getting the following exception:

unable to tunnel through proxy http 1.1 407 authentication required.But i have set the proxy user name and password.Any help on this would be better

[411 byte] By [Dinesa] at [2007-11-26 12:54:04]