Migrating DHCP from 2003 DC to 2008 R2 DC

I have migrated my DHCP instance to a new 2008 R2 DC from an old 2003 DC. All my scopes are in there and correct I have been able to authorize the instance but still can not get my PC to find it when I release and renew. I flush the DNS and stil no luck can someone help me with what I am missing?
Rick JohnsonSystems EngineerAsked:
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nsexpertsConnect With a Mentor Commented:
Have you changed the IP helper address on the router to point to your new DHCP server?
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Seth SimmonsSr. Systems AdministratorCommented:
did you try rebooting?
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Radhakrishnan RSenior Technical LeadCommented:
Hi,

Is the old 2003 server still running in your network with DHCP running? if so, I suspect this could be conflict between these 2 DHCP server. Try to disable the DHCP server on the old server and see the new 2008 server releasing IP's to the clients.

Cheers
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Rick JohnsonSystems EngineerAuthor Commented:
I am running this through a Checkpoint firewall IP 390 appliance in our local LAN, I ran through the process in technet for migration and have de-autorized the old 2003 DHCP instance and stoped the DHCP server on the 2003 domain controller. I have verified the firewall rules are the same as the 2003 DC. The differences are the OS change, The new DC is a VM in Vmware and the new DC is on a different VLAN however with the same firewall rules I should still be able to access it. I can ping the box from all my DHCP clients. any help would be very much appreciated.
thanks
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LearnctxConnect With a Mentor EngineerCommented:
Did you migrate to a new IP? If so make sure you have changed the IP's for your DHCP helpers. Can devices on the same subnet receive an IP?
Is the Windows firewall on? Make sure you allow DHCP traffic if it isn't already or turn it off.
Run Wireshark or Network Monitor: Monitor for DHCP traffic (ports 67 and 68). Are you receiving any requests.
Check event viewer for error messages.
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compdigit44Commented:
You made sure the DHCP services are running on the new server correct? Have you tried to enable DHCP logging for troubleshooting purposes
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