When running the following code:
URL url = new URL(
"https://cns-services.sun.com/UserInformationService/UserInformationServiceV1_1_0");

System.out.println("Attempting connection to: " + url.toString());

HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();

The customer gets:
Attempting connection to:
https://cns-services.sun.com/UserInformationService/UserInformationServiceV1_1_0
Exception caught: java.lang.NullPointerException

This only occurs:
1. When the customer is using JDK 1.5.0_11.  Previous versions of the JDK work fine.
2. Using proxy server "Netscape Proxy Server 3.51".  Other proxy servers work fine.

Netscape Proxy Server 3.51 was EOSL a long time ago.  So I would imagine this would be an inherent low priority.