private void doExpressInterestOnServer(boolean isDurable) {
    LogWriterUtils.getLogWriter()
        .info("Total ClientSessions " + cacheServer.getAllClientSessions().size());
    for (ClientSession c : cacheServer.getAllClientSessions()) {
      c.registerInterestRegex(SEPARATOR + "serverRegion", ".*", isDurable);
    }
  }
Written to test fix for Bug #47132
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/InterestRegrListenerDUnitTest.java