private GatewayReceiverFactory createGatewayReceiverFactory(int receiverPort) {
    GatewayReceiverFactory receiverFactory = cacheRule.getCache().createGatewayReceiverFactory();

    receiverFactory.setStartPort(receiverPort);
    receiverFactory.setEndPort(receiverPort);
    receiverFactory.setManualStart(true);
    return receiverFactory;
  }
Use of SECURITY_CLIENT_AUTHENTICATOR should result in the servers performing authentication
during HandShake of Gateway Sender/Receiver connecting.
geode-wan/src/distributedTest/java/org/apache/geode/internal/cache/wan/GatewayLegacyAuthenticationRegressionTest.java