Users cannot see the ad domain when the first ad server goes down.

I have 2 W2K  AD servers and 2 W2K member servers using MS Terminal Server. I recently purchased a new server and promoted it an AD server with the intentions of taking the first AD server I had offline. I have a total of 3 now, including the server I am going to take offline. Well, my problem is whenever I take that first server offline, none of the workststions or member servers see the domain anymore. I thought all AD components were supposed to replicate across all AD servers. Any help would be greatly appreciated.
acguess123Asked:
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corneliupConnect With a Mentor Commented:
Hi,

Usualy the first DC in the forest holds all the 5 FSMO roles, those roles are:
Schema Master - only one per forest (usualy the first DC)
Domain Naming Master - only one per forest (usualy the first DC)
Infrastructure Master - only one per forest (usualy the first DC)
RID Master - only one per forest (usualy the first DC)
PDC Emulator - only one per forest (usualy the first DC)

Before demoting the first DC in the forest you should seize or transfer  those roles to other DC's.
There are several Microsoft KB on that mater:

HOW TO: View and Transfer FSMO Roles in the Graphical User Interface
http://support.microsoft.com/default.aspx?scid=kb;en-us;255690

Windows 2000 Active Directory FSMO Roles
http://support.microsoft.com/default.aspx?scid=kb;EN-US;197132

And the one metioned by nisters10 above
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nisters10Commented:
Sounds like the workstations and member servers look at the first AD server for DNS. Install DNS on one of the other AD servers and get the clients and other servers using it correctly. Then demote the first AD server - you should also make sure you have transferred and FMO roles from the AD DC before it is demoted.

http://support.microsoft.com/default.aspx?scid=kb;EN-US;223346
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jpk300Connect With a Mentor Commented:
Make sure you have multiple global catalog servers in your domain, this could also be a problem, if only the first AD is a GC.

goto Active directory sites and services - sites - "site name" - Servers - "choose your server to make a GC" - right click and choose properties on "NTDS Settings"  - check the "Global Catalog" box.
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