I inherited a network where the Domain controllers where recently upgraded from 2003 to 2008R2. After the upgrade the DHCP MMC don't show the leases in several of the scopes, only showing a message of "There are no items to show in this view." All the scopes with the problem have reservations in them. Otherwise they are practically identical. If i use the MMC from a 2003 server i can see the leases and work with them without problem. From a Windows 7 machine i have the same problem.
How can i solve this problem? I could not find a solution in google, only some mentions of it and several "i also have this problem" but no solutions. Is it caused by the reservations? Should I record, erase and recreate them? Or this would not fix this? Has 2008R2 problems with reservations in DHCP? or the cause is totally diferent.
Aditional Information from the comments:
The server is the Enterprise Edition of Windows Server 2008R2, and does not have the Hyper-V role. There aren't superscopes in this server, we have several VLans with DHCP Helper in the Core Switch. I don't know how the migrations was done, I fear that the migration procedure linked by Ricardo Polo wasn't followed, just any kind of automatic migration there is.
Best Answer
After removing all the reserves in the affected scopes the dhcp tools in the 2008R2 server and the Windows 7 Pc could see the leases correctly. Apparently the reserve information was not migrated correctly. Several other possible solutions didn't work.
The clients were working correctly all the time this was happening, only the administration from the same server or from a W7 pc could not see the leases.