docs: @SuppressWarnings("UseOfObsoleteCollectionType")
    public Hashtable<String, String> getConnectionProperties()
    {
      StringBuilder url = new StringBuilder("ldap://");
  
      url.append(host).append(":").append(String.valueOf(port)).append("/");
  
      Hashtable<String, String> props = new Hashtable<String, String>(11);
  
      props.put(LdapContext.INITIAL_CONTEXT_FACTORY,
        "com.sun.jndi.ldap.LdapCtxFactory");
      props.put(LdapContext.PROVIDER_URL, url.toString());
      props.put(LdapContext.SECURITY_AUTHENTICATION, "simple");
      props.put(LdapContext.SECURITY_PRINCIPAL, additionalBindDN);
      props.put(LdapContext.SECURITY_CREDENTIALS, additionalBindPassword);
  
      return props;
    }