Almost all errors like this are related to some misconfiguration of DNS.  Make sure the second domain controller is pointed at your working domain controller for DNS resolution.  I have had success in the past running ipconfig /flushdns from command line, and then run ipconfig /registerdns to flush all dns records and reregister the server with your DNS server. 
Rob Humphrey
MSU Health Information Technology

 -----Original Message-----
From: MSU Network Administrators Group [mailto:[log in to unmask]]On Behalf Of Radhika
Sent: Wednesday, April 14, 2004 12:43 PM
To: [log in to unmask]
Subject: [MSUNAG] Windows 2000 additional domain controller

Hi all,
I have a Windows 2000 advanced server as my main data server. I have also built another Windows 2000 advanced server to act as a backup server. However, when I try to have it as an additional domain controller, it gives me error messages saying that the domain does not exist or cannot be contacted. I am sure that the machine is already a part of the domain and the DNS is also running.
Is there something I am missing?
Thanks in advance,
Radhika Kotwal
System Administrator, CIT
Michigan State University
(517) 449 1721 (Cell)
Web: http://www.egr.msu.edu/~kotwalra