private void startSSL(Attributes atts) {
    DistributedSystemConfig config = (DistributedSystemConfig) stack.peek();
    config.setSSLEnabled(true);

    String authenticationRequired = atts.getValue(AUTHENTICATION_REQUIRED);
    config.setSSLAuthenticationRequired(Boolean.parseBoolean(authenticationRequired));
  }
We assume that there is a <code>ManagedEntityConfig</code> on top of the stack.
geode-core/src/main/java/org/apache/geode/admin/internal/ManagedEntityConfigXmlParser.java