Domain Controller port numbers

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I'm having a problem with our Windows Server 2003. This message

  Event ID: 1054
  User: NT AUTHORITY\SYSTEM

  Windows cannot obtain the domain controller name for your computer
  network. (The specified domain either does not exist or could not
  be contacted. ). Group Policy processing aborted.


Is generated when Server 2003 boots, and tries to connect to our
Domain Controller. It is almost certainly occuring because we have
a particular port blocked on a firewall that exists between the
Server and the Domain Controller. Knowing this, I openned all the
ports I thought might be relevant.

These are the ports I have open:

  smtp          tcp  25
  bootps        udp  37
  domain (dns)  udp  53
  www           tcp  80
  ident         tcp 113
  netbios-ns    udp 137
  netbios-dgm   udp 138
  netbios-ssl   tcp 139
  ldap          tcp 389
  https         tcp 443
  ms - ds       tcp 445

But obviously, there is one, or more, ports that must be openned.
What other port[s] do we need to open to permit Windows Server 2003
to contact a domain controller at boot time?

Thanks in advance for any help.

B Squared

.

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