When I enable RDS I cannot access the server after restarting

We are trying to install ColdFusion Report Builder which requires RDS to be enabled on the server.

I have edited the web.xml file and uncommented the RDS parameters but, after restarting ColdFusion, I cannot access the server.

If I put the web.xml file back to how it was I can access the server after restarting.

Does anybody have any ideas what could be causing this?

The parts that I uncommented were as follows:

I tried with both uncommented and also just the first part uncommented but with the same results.

    <!-- begin RDS --->

    <servlet id="coldfusion_servlet_8789">

        <servlet-name>RDSServlet</servlet-name>

        <display-name>RDS Servlet</display-name>

        <servlet-class>coldfusion.bootstrap.BootstrapServlet</servlet-class>

        <init-param id="InitParam_103401311065856789">

            <param-name>servlet.class</param-name>

            <param-value>coldfusion.rds.RdsFrontEndServlet</param-value>

        </init-param>

    </servlet>

  <!---  end RDS -->

    <!-- begin RDS --->

    <servlet-mapping id="coldfusion_mapping_9">

        <servlet-name>RDSServlet</servlet-name>

        <url-pattern>/CFIDE/main/ide.cfm</url-pattern>

    </servlet-mapping>

<!---    end RDS --->

Thank you