andandolo semplicemente a confrontare con il mio smb.conf ho trovato due possibili cause:
1:
####### Authentication #######
# "security = user" is always a good idea. This will require a Unix account
# in this server for every user accessing the server. See
# /usr/share/doc/samba-doc/htmldocs/Samba3-HOWTO/ServerType.html
# in the samba-doc package for details.
security = share
dv al posto di share metti user

2:
#======================= Share Definitions =======================
# Un-comment the following (and tweak the other settings below to suit)
# to enable the default home directory shares. This will share each
# user's home directory as \\server\username
; [homes]
; comment = Home Directories
; browseable = no
dv al posto di no metti yes

prova così.