Migrating DHCP from 2003 to 2008R2 using netsh

i am trying to migrate DHCP from an x86 2003 server, to a 2008r2.
i am using netsh to migrate the database using this document:

http://support.microsoft.com/kb/962355

everything appears to copy over fine, but as soon as i unauthorise the DHCP server on the source server, and authorise the destination server, client PCs are not picking up a new IP address.

Does anyone have any advice?
HelpDeskECAsked:
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Vinchenzo-the-SecondCommented:
Do you have an IT Helpers configured on any network devices?  You may do if your DHCP is on a different subnet than your clients.  If this is the case the helpers need to be updated with the new DHCP server
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Felix LevenSenior System and DatabaseadministratorCommented:
Ok, if you do a ipconfig /release and ipconfig /renew on a client what happens?

If you take a look at the new DHCP-Server all your scopes and ip reservations look fine?
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HelpDeskECAuthor Commented:
All the scopes look fine, leases are all there etc. I have tried ipconfig /release /flush / renew. The client will just attempt to get an IP but cannot. As soon as I swap everything back to the original server the client will immediately pick an IP up.


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Felix LevenSenior System and DatabaseadministratorCommented:
OK, this should work, the only problem i can think of is that the auth/unauth of the DHCP servers is not replicated fast enough to all Domain-controllers (DNS/DS) and Clients still try to access the old one.
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HelpDeskECAuthor Commented:
yes we use an ip-helper-address on the core. I will change the IP of the DHCP server to reflect that address and retry later today. thanks
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