When first setting up your Data Portal on your server as per the Help Documentation http://www.ayanova.com/AyaNova6webHelp/data_portal_installation_and_c.htm , you perform the step where you test the connection through ASP.NET by entering in the URL
http://privateipaddress:XXXX/AyaNovaDP/DataPortal.rem?wsdl
This should bring up the web page similar to the following screenshot:
If instead you get a 404 page not found, do check that your Web Site Extensions are Allowed