samba win7访问不了是什么情况？

下面是 testparm 的内容
# Global parameters
[global]
server string = Samba Server
log file = /var/log/samba/log.%m
max log size = 50
usershare allow guests = Yes
security = USER
server role = standalone server
dns proxy = No
idmap config * : backend = tdb
[homes]
comment = Home Directories
browseable = No
read only = No
[public]
comment = Public Files
path = /home/ptz_share/public
create mask = 0766
guest ok = Yes
read only = No
[printers]
comment = All Printers
path = /var/spool/samba
browseable = No
printable = Yes
[ptz_dir]
comment = ptz private service
path = /home/ptz_share/private
read only = No
valid users = ptz_share

这是 配置文件
[global]
workgroup = WORKGROUP
server string = Samba Server
server role = standalone server
security = user
usershare allow guests = yes
log file = /var/log/samba/log.%m
max log size = 50
passdb backend = tdbsam
dns proxy = no
#============================ Share Definitions ==============================
[homes]
comment = Home Directories
browseable = no
writable = yes
[public]
comment = Public Files
browseable = yes
writable = yes
create mode = 0766
guest ok = yes
path = /home/ptz_share/public
public = yes
# NOTE: If you have a BSD-style print system there is no need to
# specifically define each individual printer
[printers]
comment = All Printers
path = /var/spool/samba
browseable = no
# Set public = yes to allow user 'guest account' to print
guest ok = no
writable = no
printable = yes
[ptz_dir]
comment = ptz private service
path = /home/ptz_share/private
valid users = ptz_share
available = yes
browseable = yes
public = no
writable = yes
printable = no

有人知道是什么情况吗？
我记得以前我开 samba 没这么费劲啊。。。