public static void reRegisterK1AndK2() {
    Region r = cache.getRegion(SEPARATOR + REGION_NAME);
    assertNotNull(r);
    List list = new ArrayList();
    list.add(k1);
    list.add(k2);
    r.registerInterest(list);
  }
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