Samba bloqueia acesso ha alguns pc's na rede

Pessoal sou novo aqui no forum e iniciante no linux, peço desculpas se errei alguma coisa no post.

Seguinte, to com um problema no minimo estranho em minha rede.

Ela é controlada pelo samba no debian lenny, o ip da rede é fixo os pc's são xp aluns SP2 e outros SP3 cadastrados no dominio o dns esta em outra maquina junto com o firewall. O que esta acontecendo é que alguns pc's começam a bloquear o acesso de outros pc's tipo da aquela frase de que diz:

"\\10.1.... não esta acessivel. Talvez você não tenha permissão para usar este recurso de rede..."

Mas as pasta compartilhadas no samba acessa normalmente o problema é so entre as estações.

logo que o pc inicia blz, acessa mas despois de uns 5 a 10 minutos bloqueia, ja tentei mexer em um monte de coisas no infeliz do XP mas acho que talvez possa ser algo com o dominio no samba sei la aguem poderia me dar um luz?
desde já agradeço.

Coloque no post a cópia do smb.conf para que possamos analisá-lo.

Ok segue o smb.conf

[global]
guest account = nobody
smb passwd file =/etc/samba/smbpasswd
name resolve order = lmhosts host wins bcast
# socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
bind interfaces only = yes
admin users = root, valerio, ricardo
obey pam restrictions = true
net bios name = SERVIDOR
workgroup = CENTURY
server string = Servidor de Arquivos
log file = var/log/samba/log.%m
max log size = 1000
syslog = 0
panic action = /usr/share/samba/panic_action %d
domain master = yes
domain logons = yes
preferred master = true
encrypt passwords = true
local master = yes
logon drive = W:
logon path = C:\Documents and Settings\%U\profile
logon script = \\%L\script.bat\%U
preserve case = true
case sensitive = false
os level = 100
wins support = yes
time server = yes

# lixeira
vfs objects = recycle
recycle:keeptree = yes
recycle:versions = yes
recycle:exclude = *.tmp, *.log, *.obj, *.bak, *.aif, *.iso, *.mp3, *.scr *.inf, *.com, autorun.info
# veto a gravacao de certos arquivos no servidor
veto files = /*.aif/*.avi/*.com/*.pif/*.mp3/*.bat/*.src


[%U]
comment = Pasta do usuario %U
path = /home/%U
public = no
create mode = 0750
directory mode = 0750
browseable = true
writable = true
inherit permissions = true
vfs objects = recycle


[netlogon]
comment = Diretorio de Inicialização dos Terminais
path = /home/netlogon
read only = true
browseable = no
public = true
available = true


[profiles]
path = /home/profile
read only = false
create mask = 0600
directory mask = 0700
browseable = false


[backup]
path = /backup
security = share
comment = Diretorio de Backup
writable = true
public = true
browseable = false
directory mask = 666
create mode = 666
inherit permissions = true

#Lixeira
vfs objects = recycle
recycle:keeptree = yes
recycle:versions = yes
#recycle:repository = lixeira
recycle:exclude = *.tmp, *.log, *.obj, *.bak, *.aif, *.iso, *.mp3, *.scr *.inf, *.com, autorun.info


[compartilha]
path = /home/samba/compartilha
security = share
comment = Diretorio de compartilhamento de arquivos
writable = true
public = true
browseable = true
invalid users = fulano #Adicione aqui os nomes que não poderam acessar o compartilha
directory mask = 0750
create mode = 0750
inherit permissions = true
veto files = /*.aif/*.avi/*.com/*.pif/*.mp3/*.bat/*.src

vfs objects = recycle
recycle:keeptree = yes
recycle:versions = yes
#recycle:repository = lixeira
recycle:exclude = *.tmp, *.log, *.obj, *.bak, *.aif, *.iso, *.mp3, *.scr *.inf, *.com, autorun.info


[custo]
path = /home/samba/custo
security = share
comment = Diretorio de compartilhamento de arquivos
valid users = andre, ricardo, lucas, toyoshima, valerio
writable = true
public = true
browseable = false
directory mask = 0770
inherit permissions = true

vfs objects = recycle
recycle:keeptree = yes
recycle:versions = yes
#recycle:repository = lixeira
recycle:exclude = *.tmp, *.log, *.obj, *.bak, *.aif, *.iso, *.mp3, *.scr *.inf, *.com, autorun.info


[marketing]
path = /home/samba/marketing
security = share
comment = Diretorio de compartilhamento de arquivos
writable = true
public = true
browseable = false
directory mask = 0770
inherit permissions = true

vfs objects = recycle
recycle:keeptree = yes
recycle:versions = yes
#recycle:repository = lixeira
recycle:exclude = *.tmp, *.log, *.obj, *.bak, *.aif, *.iso, *.mp3, *.scr *.inf, *.com, autorun.info



[fotos]
path = /home/samba/fotos
security = share
comment = Diretorio compartilhado de fotos acesso livre a todos
writable = true
public = true
browseable = true
directory mask = 666
create mode = 666
inherit permissions = true

vfs objects = recycle
recycle:keeptree = yes
recycle:versions = yes
#recycle:repository = lixeira
recycle:exclude = *.tmp, *.log, *.obj, *.bak, *.aif, *.iso, *.mp3, *.scr *.inf, *.com, autorun.info
veto files = /*.aif/*.avi/*.com/*.pif/*.mp3/*.bat/*.src



[cad]
path = /home/samba/cad
security = share
comment = Diretorio de compartilhamento de arquivos aqui add
writable = true
public = true
browseable = false
directory mask = 0770
valid users = sidney, andre, ricardo, everaldo, valerio
inherit permissions = true

vfs objects = recycle
recycle:keeptree = yes
recycle:versions = yes
#recycle:repository = lixeira
recycle:exclude = *.tmp, *.log, *.obj, *.bak, *.aif, *.iso, *.mp3, *.scr *.inf, *.com, autorun.info
veto files = /*.aif/*.avi/*.com/*.pif/*.mp3/*.bat/*.src



[cad-lixo]
writable = true
path = /home/samba/cad-lixo
create mask = 0770
valid users = sidney, everaldo, andre, ricardo, valerio

public = true
inherit permissions = true
browseable = false

#Lixeira
vfs objects = recycle
recycle:keeptree = yes
recycle:versions = yes
#recycle:repository = lixeira
recycle:exclude = *.tmp, *.log, *.obj, *.bak, *.aif, *.iso, *.mp3, *.scr *.inf, *.com, autorun.info

[area-tecnica]
writable = true
path = /home/samba/area-tecnica
create mask = 0770
valid users = sidney, everaldo, andre, ricardo, valerio
public = true
inherit permissions = true
browseable = false

#Lixeira
vfs objects = recycle
recycle:keeptree = yes
recycle:versions = yes
#recycle:repository = lixeira
recycle:exclude = *.tmp, *.log, *.obj, *.bak, *.aif, *.iso, *.mp3, *.scr *.inf, *.com, autorun.info
veto files = /*.aif/*.avi/*.com/*.pif/*.mp3/*.bat/*.src/


[cad-compartilha]
writable = true
path = /home/cad-compartilha
create mask = 0770
valid users = ricardo, valerio, sidney, everaldo, lucas, angelica
public = true
inherit permissions = true
browseable = false

#Lixeira
vfs objects = recycle
recycle:keeptree = yes
recycle:versions = yes
#recycle:repository = lixeira
recycle:exclude = *.tmp, *.log, *.obj, *.bak, *.aif, *.iso, *.mp3, *.scr *.inf, *.com, autorun.info
veto files = /*.aif/*.avi/*.com/*.pif/*.mp3/*.bat/*.src/

#condigo para ingresso do Win7
Level0 oplocks = no
ntlm auth = YES
lanman auth = YES