Adding whitelist to PMP

Hi

I'm trying to add a whitelist to only allow access to PMP from only itself (the server where PMP is installed).  I created the following rule as per the documentation:

        <Context path="" docBase="PassTrix" debug="0" useHttpOnly="true"/>
          <Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="127.0.0.1"/>
        <!--Context appBase="" debug="99" docBase="${server.dir}/help" path="/help" reloadable="true"/-->

But when I try and connect via the browser it seems to connect but I just get a blank screen?  Does anyone have any ideas what I might be doing wrong?  Server has been restarted.

Thanks