[Samba] Logon problem with windows 9x

["Javier D. Pérez"]

Hi,

I have samba 3.0.7 and is the domain controller for all the machines.
The windows 9x has problems when the users try to logon. There are 
moments the server denies the logon and a few minutes later the same 
user can logon.

Here is my smb.conf file:
/# Global parameters
[global]
        workgroup = DOMAIN
        netbios name = NASCS
        server string = NASCS: Servidor de archivos centralizado
        encrypt passwords = yes
        passdb backend = smbpasswd guest
        unix charset = ISO8859-1
        log file = /var/log/samba/log.%m
        socket options = SO_KEEPALIVE IPTOS_LOWDELAY TCP_NODELAY
        logon path = \\%N\%U\profile
        logon  drive = H:
        logon home = \\%N\%U
        domain logons = Yes
        os level = 64
        domain master = yes
        wins support = yes
        admin users = @administradores
        write list = @administradores
        syslog = 1
        log level = 4
        panic action = /usr/share/samba/panic-action %d
        passdb backend = smbpasswd
        obey pam restrictions = yes
        passwd program = /usr/bin/passwd %u
        passwd chat = *Enter\snew\sUNIX\spassword:* %n\n 
*Retype\snew\sUNIX\spassword:* %n\n
        #veto files = /*.eml/*.nws/riched20.dll/*.{*}/

[profiles]
    comment = Perfiles de usuarios
    path = /home/samba/profile
    writable = yes
    create mask = 0600
    directory mask = 0700
    browseable = No
    read only=no

[homes]
        comment = Home Directories
        writable = yes
        read only = No
        create mask = 0640
        directory mask = 0750
        browseable = No/


Here is the log of the nmbd server when the user PBJ tries to logon:
/nascs:/var/log/samba# tail -f log.nmbd | grep PBJ
      question: q_name=PBJ<03> q_type=32 q_class=1
      additional: nmb_name=PBJ<03> rr_type=32 rr_class=1 ttl=300000
  wins_process_name_registration_request: Unique name registration for 
name PBJ<03> IP 192.168.2.203
  add_name_to_subnet: Added netbios name PBJ<03> with first IP 
192.168.2.203 ttl=300000 nb_flags= 0 to subnet WINS_SERVER_SUBNET
  reply_netbios_packet: sending a reply of packet type: wins_reg PBJ<03> 
to ip 192.168.2.203 for id 62
      answers: nmb_name=PBJ<03> rr_type=32 rr_class=1 ttl=300000
  PBJ<03>             TTL = Thu Sep 30 23:26:33 2004    192.168.2.203  4
      question: q_name=PBJ<03> q_type=32 q_class=1
      additional: nmb_name=PBJ<03> rr_type=32 rr_class=1 ttl=0
  wins_process_name_release_request: Unique name release for name 
PBJ<03> IP 192.168.2.203
  reply_netbios_packet: sending a reply of packet type: nmb_rel PBJ<03> 
to ip 192.168.2.203 for id 68
/
Does anybody happen the same? Are there a solution?