DHCP on Windows Server 2008R2 Standard not working

We have built a new Windows Server 2008 Domain Controller and deployed it into the environment to replace an existing 2003 DC.  Our problem is that the new DHCP server will not give out addresses.  We have verified that it is authorized.  We have done the following to try to correct the problem.

Removed and reinstalled the dhcp server role.
Removed and recreated the scope.
rebooted the server multiple times.

Any help would be appreciated.
Bobby AshtonIT DirectorAsked:
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Bobby AshtonIT DirectorAuthor Commented:
Finally found the problem.  We have a Catalyst Express 500 switch located at that office and apparently there are port roles that get assigned by default on that switch.  The port that had the new server would not pass broadcast traffic effectively blocking dhcp from working.  As soon as the port settings were changed all was good.
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Dimitris IoakimoglouNetwork AdministratorCommented:
Do you see bad addresses piling up or is it just empty?
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xDUCKxCommented:
If it's authorized and the scope is active, then it might be a firewall issue.  Verify that the firewall is turned off and you don't have any antivirus/software firewalls in the way.  As a bare minimum, you can open port 67 for DHCP:

http://technet.microsoft.com/en-us/library/ee941126(v=ws.10).aspx
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Bobby AshtonIT DirectorAuthor Commented:
There are no addresses at all and the firewall on the server is turned off.
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AkulshCommented:
Do you see any errors in Event logs?
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Bobby AshtonIT DirectorAuthor Commented:
No errors.  DHCP event log says that its ready to service clients.
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AkulshCommented:
Are there other DHCP servers in the network?

When you try to obtain DHCP lease from a workstation (Ipconfig /renew), what is the response? If unsuccessful, please see the event log of that PC, and let us know of any errors. Also ping the DHCP server from the workstatin.
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Krzysztof PytkoSenior Active Directory EngineerCommented:
I would suggest to remove that server from authorization list from a domain and then authorize it again. Please follow steps described by me in this post
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/Q_27830468.html

and follow comment ID: 38303611

after all. authorize DHCP server again as Enterprise Administrator or a member of DHCP Admins and check if it is working

Regards,
Krzysztof
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AkulshCommented:
Kindly let us know what port or ports the Catalyst switch was blocking. Thanks.
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Bobby AshtonIT DirectorAuthor Commented:
We can thank Microsoft for this one.  We called them and they helped us work it out.  We used packet capture such as wireshark to determine that the server was not receiving the requests.
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