At one point you must have "known" the LAN IP of the DNAS PC because it is the "target" of your port forwarding exercise. This means you can check with the router and review your port forward config to get the IP, or you can run ipconfig /all
on the DNAS PC to get the IP address.
This address is so important to you, you must carve this IP into the nearest tree, and write it down in permanent ink and carry it with you at all times.
Bookmark the link to your DNAS station page.
the format is http://(((put your IP in here)))
:(((put your dnas portbase here)))
(((I shouldn't have to say this, but leave the parenthesis out)))
For you and you alone on your lan and on the DNAS PC, you can also use http://127.0.0.1:8000/
(if 8000 is your portbase, otherwise replace it with yours) to view the station page. The important thing is to notice the format -- only numbers.
add [append] listen.pls for a listen link, but keep in mind that it's always better to view the station page because it contains all the other links you need including a listen link with the proper IP address for you to use.