Samba share not visible from "net view" or from WD TV live device

[JKScotland]

Hi folks, I've been googling and messing around with settings for a while now, but can't get this working.

I've got a Samba server running on Centos 6 - it's just set up for basic file sharing, no clever security in place. I can map it as a drive in windows using \\nas\share, and I can mount it in ubuntu.

However, I got a new WD TV live, and it can't see it as a network share. Also "net view" in windows doesn't see it, but "net view \\nas" does bring back info.

[global]
workgroup = WORKGROUP
netbios name = nas
server string = %h server (Samba, Centos)
wins support = no
security = share
hosts allow = 192.168.1.0/24
browseable = yes

[nas]
comment = Kerr File Server
path = /var/NAS
force user = fileserver901
force group = fileserver901
guest ok = yes
read only = no

My main thing is to allow the WD TV box to see the share, but I think they're both connected. Is there anything I need to do to make this (more) visible on the network?

Thanks