DHCP not working on new Windows 2008 R2

Hi.
I'm migrating from SBS 2008 to Win 2008 R2 Ent.  When I deactivate DHCP on the SBS and active it on the New server The clients are not being assigned IP addresses.  I have check the firewall on the new server and I've tried releasing the ip on the clients.  I even change the time on the SBS to force the IP to expire in 15 min.  Any help would be much appreciated.
tips54Asked:
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tips54Connect With a Mentor Author Commented:
I was able to resolve this issue. My Cisco switch was configured to use the SBS as DHCP. dhcp helper command was used.
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Cliff GaliherCommented:
Did you "authorize" the new DHCP server? Step 4:
http://technet.microsoft.com/en-us/library/dd379483(v=ws.10).aspx
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aadi369Commented:
First Authorize the DHCP server. Then reconsile the DHCP server and check for error, if any.....u can ran Best Practice Analyzer to check the issue also.

:)
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tips54Author Commented:
I did authorize it via the gui. I have the following in the logs.

This computer has at least one dynamically assigned IPv6 address.For reliable DHCPv6 server operation, you should use only static IPv6 addresses.

The DHCP service has detected that it is running on a DC and has no credentials configured for use with Dynamic DNS registrations initiated by the DHCP service.   This is not a recommended security configuration.  Credentials for Dynamic DNS registrations may be configured using the command line "netsh dhcp server set dnscredentials" or via the DHCP Administrative tool.
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aadi369Commented:
This behavior occurs because you did not configure the DNSCredentials on the domain controller on which you installed the DHCP Server service, and DNS services.

Kindly refer below link and do the needful.

http://support.microsoft.com/kb/282001
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tips54Author Commented:
I had addressed that one.  The admin credential is in there.
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aadi369Commented:
Re-Enter the password and restart the DHCP services on the server.
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tips54Author Commented:
I did. still the same issue.  i'm thinking this is because SBS is still on the network.  I will finish the migration today after work.  When I stop the service and reactive it on the SBS server it comes back up with no problem.
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tips54Author Commented:
took care of it
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