adding my windows xp to centos 5.6 PDC domain

[majorlen]

First i will give the overview of my network:

I have one Centos server and one XP machine, both connected to LAN ports on ADSL modem. Therefore the get dynamic public IP addresses:

I have a running DYNDNS running properly on Centos, SSL server and Apache webserver, recently i set up SAMBA server and looks like its configured properly too. unfortunately i cannot join the Domain with the xp machine.even though i can nslookup from xp to mydomain and i can ping forward and backward.

The problem is when i try to join the domain the error is as follows:

A domain controller for the domain xxxx could not be contacted

Details:

Note: This information is intended for a network administrator. If you are not your networks administrator, notify the administrator that you received this information, which has been recorded in the file C:\WINDOWS\debug\dcdiag.txt.

The domain name MYDOMAIN might be a NetBIOS domain name. If this is the case, verify that the domain name is properly registered with WINS.

If you are certain that the name is not a NetBIOS domain name, then the following information can help you troubleshoot your DNS configuration.

The following error occurred when DNS was queried for the service location (SRV) resource record used to locate a domain controller for domain MYDOMAIN:

The error was: "DNS name does not exist."
(error code 0x0000232B RCODE_NAME_ERROR)

The query was for the SRV record for _ldap._tcp.dc._msdcs.MYDOMAIN

Common causes of this error include the following:

- The DNS SRV record is not registered in DNS.

- One or more of the following zones do not include delegation to its child zone:

MYDOMAIN
. (the root zone)

For information about correcting this problem, click Help.



[root@ ~]# tail -f /var/log/messages
May 24 20:02:26 nmbd[13144]:
May 24 20:02:26 nmbd[13144]: Samba server LINUXSHARE is now a domain master browser for workgroup MYDOMAIN on subnet XX.XX.XX.XX
May 24 20:02:26 nmbd[13144]:
May 24 20:02:26 nmbd[13144]: *****
May 24 20:02:41 nmbd[13144]: [2011/05/24 20:02:41, 0] nmbd/nmbd_become_lmb.c:become_local_master_stage2(396)
May 24 20:02:41 nmbd[13144]: *****
May 24 20:02:41 nmbd[13144]:
May 24 20:02:41 nmbd[13144]: Samba name server LINUXSHARE is now a local master browser for workgroup MYDOMAIN on subnet XX.XX.XX.XX
May 24 20:02:41 nmbd[13144]:
May 24 20:02:41 nmbd[13144]: *****


[root@ ~]# cat /etc/samba/smb.conf
# Samba Config - smb.conf
[global]
workgroup = MYDOMAIN
netbios name = linuxshare
server string = Linux PDC
security = user
add user script = /usr/sbin/useradd -s /bin/bash -m %u
add group script = /usr/sbin/groupadd %g
add machine script = /usr/sbin/useradd -n -c 'Workstation (%u)' -M -d /nohome -s /bin/false '%u'
#add machine script = /usr/sbin/useradd -s /bin/false -d /dev/null '%u'
passdb backend = tdbsam
load printers = yes
default service = global
path = /data
smb ports = 139
smb ports = 445
smb ports = 137
smb ports = 138
available = yes
encrypt passwords = yes
#add machine script = /usr/sbin/useradd -n -g machines -d /dev/null -s /sbin/nologin %u
interfaces = lo eth0
#hosts allow = XX.XX.XX.0/20 127.0.0.0/24
dns proxy = no
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192

#The domain and local master browser
domain logons = yes
os level = 64
preferred master = yes
domain master = yes
local master = yes
wins support = yes
username map = /etc/samba/smbusers
#name resolve order = wins bcast hosts
logon path = \\%L\profiles\%u\%m
logon script = netlogon.bat

#Automatically maps the home directory of the user
logon drive = q:
#Log level
log level = 3
#users configure
add user script = /usr/sbin/useradd -m %u
delete user script = /usr/sbin/userdel -r %u
add group script = /usr/sbin/groupadd %g
delete group script = /usr/sbin/groupdel %g
add user to group script = /usr/sbin/usermod -G %g %u
add machine script = /usr/sbin/useradd -s /bin/false -d /var/lib/nobody/ %u
idmap uid = 15000-20000
idmap gid = 15000-20000

#sync smb passwords
passwd program = /usr/bin/passwd %u
passwd chat = *Enter\snew\sUnix\spassword:* %n\n *retype\snew\sUnix\spassword: %n\n .
passwd chat debug = yes
unix password sync = yes

#Necessary share for the domain controller
[netlogon]
path = /var/samba/netlogon
admin users = Administrator, leonard
valid users = %U
read only = no

#Home configuration
[homes]
comment = Home
valid users = %S
read only = No
browseable = No
writeable = yes

#Profile configuration
[profile]
path = /home/samba/profiles
valid users = %U
create mode = 0600
directory mode = 0700
writable = Yes
browsable = No

#Share directory for all users
[allusers]
path = /home/shares/users
valid users = @users
force group = users
create mask = 0660
directory mask = 0771
writable = yes

[share]
writeable = yes
admin users = leonardr
path = /data/share
force user = root
valid users = leonardr
public = yes
available = yes