samba over BT PAN and PPP

when try to connect with PC using samba via BT PAN and PPP, the following line should be commented:

/home/etc/samba/smb.conf
...
# interfaces = usbd0 eth0 bnep0 irda0 irda1 pppd0
...

eventhough all corresponding interfaces (bnep0 and pppd0) specified, if uncommented the abovementioned line, samba didn't work.