On windows Vista invocation of MulticastSocket.setNetworkInterface(ni) doesn't set NetworkInterface as expected, if ni is a real network interface.

The result of the execution of the following lines might be "false":
  ms.setNetworkInterface(ni);
  newNi = ms.getNetworkInterface();
  System.out.println(ni.equals(newNi));

The bug is reproducible only on Vista. JCK tests work fine on Solaris, Linux, win XP.

The minimized test demonstrating the bug:

------ 8< ---------------------------
import java.io.IOException;
import java.net.*;
import java.util.*;

public class Test {
    
    public Test() {
    }

    public static void main(String[] args) {
        boolean passed = true;
        try {
                                    
            MulticastSocket ms = new MulticastSocket();
            Enumeration<NetworkInterface> allNI =
                    NetworkInterface.getNetworkInterfaces();
            while (allNI.hasMoreElements()) {
                NetworkInterface ni = allNI.nextElement();
                if (ni.isUp() && ni.supportsMulticast()) {
                    printNI(ni);
                    ms.setNetworkInterface(ni);
                    NetworkInterface newNI = ms.getNetworkInterface();
                    if (ni.equals(newNI)) {
                        System.out.println(" OK");
                    } else {
                        System.out.println("FAILED!!!");
                        printNI(newNI);
                        passed = false;
                    }
                    System.out.println("------------------");
                }
            }
        } catch (IOException e) {
            e.printStackTrace(System.out);
            passed = false;
        }
        System.out.println(passed ? "Test passed " : "Test failed");
    }

    private static void printNI(NetworkInterface ni) throws SocketException {
        System.out.println("Name " + ni.getName());
        Enumeration<InetAddress> en = ni.getInetAddresses();
        while (en.hasMoreElements()) {
            System.out.println(" InetAdress: " + en.nextElement());
        }
        System.out.println("HardwareAddress: " + Arrays.toString(ni.getHardwareAddress()));
        System.out.println("loopback: " + ni.isLoopback() +
                "; pointToPoint: " + ni.isPointToPoint() +
                "; virtual: " + ni.isVirtual() +
                "; MTU: " + ni.getMTU());
    }
}
------ 8< ---------------------------

Output from the test


Name lo
  InetAdress: /0:0:0:0:0:0:0:1
  InetAdress: /127.0.0.1
HardwareAddress: []
loopback: true; pointToPoint: false; virtual: false; MTU: -1
  OK
------------------
Name eth2
  InetAdress: /10.16.32.73
HardwareAddress: [0, 15, -22, 56, -37, -16]
loopback: false; pointToPoint: false; virtual: false; MTU: 1500
FAILED!!!
Name null
  InetAdress: 0.0.0.0/0.0.0.0
HardwareAddress: null
loopback: false; pointToPoint: false; virtual: false; MTU: -1
------------------
Test failed