Restricting access the JSS WebApp

We've been adding the following to the web.xml to restrict access to the JSS WebApp

<!-- Restrict Access to JSS via IP Address -->
<filter>
  <filter-name>Custom-RemoteAddrFilter</filter-name>
  <filter-class>org.apache.catalina.filters.RemoteAddrFilter</filter-class>
  <init-param>
    <param-name>allow</param-name>
    <param-value>"REGEX_IP_VALUES"</param-value>
  </init-param>
  <init-param>
    <param-name>denyStatus</param-name>
    <param-value>404</param-value>
  </init-param>
</filter>
<filter-mapping>
  <filter-name>Custom-RemoteAddrFilter</filter-name>
  <servlet-name>PresentationLayerServlet</servlet-name>
  <servlet-name>FrontEndController</servlet-name>
  <servlet-name>FrontEndUploadController</servlet-name>
  <servlet-name>RestletServlet</servlet-name>
</filter-mapping>

But since upgrading to 10.6 this seems to have stopped working. Has anyone else doing something similar with 10.6?

Thanks.