I'm in an active directory environment at home, and I assume that has something to do with it. No matter what username and password I use, it's rejected.
Kodi has no issues with connecting to my server via SMB, though I assume it's a different method the way Nvidia is doing it.
Anyone else ran into this issue?
Having the same problem with a GoFlex Home on my LAN. Details here on my post in /r/ShieldAndroidTV.