Samba works with W2003 but not with win-XP, with ZIM Application

Hi,
I have a very strange problem happening, we have an ERP application that
uses ZIM (SIENGE), and the users access it by a sharing in a samba server in
a debian sarge linux 2.6.8.
The shortcut in the XP desktop:
(\\10.0.0.254\siengea\Util\zimrtmu.exe<file://10.0.0.254/siengea/Util/zimrtmu.exe>
)
The SIENGE have some modules: Engineering, supplyes, commercial, financial,
etc.
All of the PC clients are Win XP PRO 2002 SP2 with execption of only one
that is W2003 server, and this is the only one that works perfectly for
wathever user and with a good speed.

But for all the XP's, some problems happen:- some users connect and tunn de
system, but very slow. We can take a coffe until the sistem show the
repports.
- some users only can open the application after many tries. because gives a
mesage thar the application is already in use by another user.

If I get a user with problem and acces with his login in the w2003 server,
it works perfectly.
I already make some changes in the socket options and locks options in the
smb.conf, but nothin resolved.

Here is my actual configs:

The version of samba are:
dpkg -l | grep -i samba
ii libcrypt-smbha 0.02-6 generate LM/NT hash of a password for
samba
ii samba 3.0.14a-3sarge a LanManager-like file and printer server
fo
ii samba-common 3.0.14a-3sarge Samba common files used by both the server
a
ii smbldap-tools 0.8.7-4 Scripts to manage Unix and Samba accounts
st
ii swat 3.0.14a-3sarge Samba Web Administration Tool



Linux debian sarge 2.6.8
Pentium 4 2.8G
512M RAM

cat smb.conf
[global]
unix charset = cp850
workgroup = EMPRESA
netbios name = SERVER
username map = /etc/samba/smbusers
admin users= @"Domain Admins"
server string = Servidor PDC EMPRESA
encrypt passwords = Yes
obey pam restrictions = No
guest account = nobody
map to guest = Bad User
log level = 0
log file = /var/log/samba/samba.log.%m
max log size = 50
debug timestamp = yes
domain logons = Yes
preferred master = Yes
domain master = Yes
idmap uid = 1000-2000
idmap gid = 1000-2000
map acl inherit = Yes
passdb backend = ldapsam:ldap://127.0.0.1
ldap passwd sync = Yes
ldap admin dn = cn=admin,dc=exemplo,dc=com,dc=br
ldap suffix = dc=exemplo,dc=com,dc=br
idmap backend = ldap:ldap://127.0.0.1
ldap user suffix = ou=people
ldap group suffix = ou=groups
ldap machine suffix = ou=machines
ldap delete dn = Yes
map acl inherit = Yes

#Acrescentado 09-11-2006
os level = 254
socket options = IPTOS_LOWDELAY TCP_NODELAY
read raw = yes
write raw = yes
oplocks = yes
max xmit = 65535
dead time = 15
getwd cache = yes
lpq cache = 30


[NETLOGON]
path = /var/lib/samba/netlogon
write list = ntadmin

[PROFILES]
path = /home/profiles
read only = No
create mask = 0700
directory mask = 0700
guest ok = Yes

[homes]
comment = Repositorio de %U
create mask = 0644
directory mask = 0775
valid users = %S
read only = No
browseable = No

# compartilhamento onde fica o aplicativo em ZIN
[SIENGEA]
path = /home/siengea
write list = administrator, @wheel, @staff
read only = No
create mask = 0777
directory mask = 0777
guest ok = Yes
delete readonly = Yes
oplocks = no



If someone have some tips that could help me, they will be welcome.

Sincerely

Alexandre Nuernberg.

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