Remove 1 of the 3 domain controllers in a Windows environment

I have a Windows domain that has Windows 2003 and 2008 R2 servers to support workstations, SharePoint and exchange among other things. There are 3 domain controllers. The first domain controller created on window 2003 server. Later, more 2 domain controllers were added on Windows 2008 R2. During the promotion of each of the servers in DC, each of them were activated as DNS and Global catalog servers. In addition, both 2008 DHCP configuration on them were servers and one Server 2008 R2 is configured as primary and the second as the secondary. The 2003 is just a DC member. I made main hold all 5 FSMO roles and replication works as well on both servers.
I now have to demote the first Windows Server 2003, and then it must be taken out of the area. But whenever I have to run DCPromo to demote the server he kept a message that no other DC cannot be contacted, and when I try to disable the NIC in Server 2003, replication will stop automatically on the two 2008 R2.

Any help please.
Thanks in advance.

Hello

Post your question in the TechNet Server Forums, as your question kindly is beyond the scope of these Forums.

http://social.technet.Microsoft.com/forums/WindowsServer/en-us/home?category=WindowsServer

See you soon.

Tags: Windows

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