Custom 403 not working

We have an app that we want to limit down to be used just at our main campus.  I have set up an IP Filter so only our outbound IP addresses can connect to the app.  We also set up a custom domain for the app as well.  We want anyone not on campus to get a custom 403 message.   I went through the tutorial at for created and uploading custom error pages.   If I stop the app, we see the custom offline.html page but if I start the app and then try to get to the app outside of the IP Filter, all I end up with is the nginx 403 Fobidden error message.   I can navigate to and the custom page comes up properly.   What am I missing and is there anything else I need to do to get the custom 403 error message to be used.  
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