[Samba] Wins XP cannot login domain if samba offline

[Indracyd]

Dear all

i have successfully setup samba on RHEL 5, but when the server samba offline why the computer client (Wins XP) cannot login?

can someone help me how to fix this problem, i won if samba server offline the client still have login with domain, and work by local harddisk

here is my smb.conf

[global]

workgroup = DLS
server string = Samba Server Version %v
netbios name = PDCDLS


log file = /var/log/samba/%m.log
max log size = 2048


security = user
passdb backend = tdbsam
domain master = yes
domain logons = yes

logon script = %u.bat
logon path =  
wins support = yes
idmap uid = 10000-20000
idmap gid = 10000-20000

[netlogon]
    comment = Network Logon Service
    path = /var/lib/samba/netlogon
    guest ok = yes
    writable = no
    share modes = no
[Profiles]
    path = /var/lib/samba/profiles
    browseable = no
    guest ok = yes
    writable = yes

thank before
Cyd