Try adding your router IP to the DNS and Gateway settings. Think your router IP is not the usual 192.168.1.1...
I added a Roamio and did not add in the DNS and Gateway IP to my wireless. I did with the Series 3.
Original S1 (Recycle Heaven)
Series 2 (PLS, sold)
TiVo HD (XL, PLS, "652")
Juliet Basic (4XL, PLS)
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!