java/net/MulticastSocket/NoLoopbackPackets.java fails intermittently with following error:

----------System.out:(2/83)----------
We should not receive anything from following groups, but we did:
/224.1.1.1:47768
----------System.err:(12/631)----------
java.lang.RuntimeException: test failed.
at NoLoopbackPackets.main(NoLoopbackPackets.java:116)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:502)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:218)
at java.lang.Thread.run(Thread.java:745)