@Override
      public boolean done() {
        iter_prox = ccn.getClientProxies().iterator();
        if (iter_prox.hasNext()) {
          proxy = (CacheClientProxy) iter_prox.next();
          return proxy._messageDispatcher.isAlive();
        } else {
          return false;
        }
      }
Given a server port (PORT1, PORT2, or PORT3) return its vm.

@since GemFire 5.7
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/HAInterestTestCase.java