Should I and how do I, run Active Directory into my DMZ?

Hi,

My level of knowledge on Firewalls and Active Directory is pretty basic and I would appreciate some expert advice please.

I am trying to allow my windows 2003 & 2000 servers in my DMZ to connect to the 2003 Domain Controller in the LAN but I am getting errors with regards to the secure connection failing and there being no logon servers available:

Event ID: 5719
This computer was not able to set up a secure session with a domain controller in domain <DOMAIN> due to the following:
There are currently no logon servers available to service the logon request.  

Event ID: 1053
Windows cannot determine the user or computer name. (The specified domain either does not exist or could not be contacted. ). Group Policy processing aborted.

Firstly, is it good practice to allow Active Directory through into the DMZ?

I have opened up the following ports on the Firewall (Fortigate 60) as per KB 179442 (http://support.microsoft.com/kb/179442)

Client Port(s)      Server Port      Service
137/UDP      137/UDP      NetBIOS Name
138/UDP      138/UDP      NetBIOS Netlogon and Browsing
1024-65535/TCP      139/TCP      NetBIOS Session
1024-65535/TCP      42/TCP      WINS Replication

Client Port(s)      Server Port      Service
1024-65535/TCP      135/TCP      RPC
1024-65535/TCP      1024-65535/TCP      LSA RPC Services (*)
1024-65535/TCP/UDP      389/TCP/UDP      LDAP
1024-65535/TCP      636/TCP      LDAP SSL
1024-65535/TCP      3268/TCP      LDAP GC
1024-65535/TCP      3269/TCP      LDAP GC SSL
53,1024-65535/TCP/UDP      53/TCP/UDP      DNS
1024-65535/TCP/UDP      88/TCP/UDP      Kerberos
1024-65535/TCP      445/TCP      SMB


As a test I set my Firewall to allow all through from the DMZ to the LAN and then ran a

dia sni pa dmz host 192.168.4.100' (the dmz servers IP address)

while performing an nltest /sc_reset:<DOMAIN NAME> and it passes with a success

All of the ports listed in the sniff were covered in my ports I have opened on the Firewall and I have attached this image to this question. So far so good.

Going back to the Firewall and switching off the allow all and re-running the nltest /sc_reset fails with:

1311 0x51f ERROR_NO_LOGIN_SERVERS

and this is where I am stumped, as far as I can see I have the correct ports listed.

any advice appreciated,


thanks.