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windwos 2012 DC error

I have recently migrated a windows 2008 DC to windows 2012 and it is completed.
now 2012 is the GC and demoted the 2008 server. 2008 was the dhcp server and I installed dhsp role in 2012 and unauthorised 2008 server. migrated the dhcp config also to 2012 server.
but dhcp leasing is not working at all and it is giving errors like 1046 and 1056.
1 Solution
Zephyr ICTCloud ArchitectCommented:
Error 1046 means the DHCP server needs to be authorized

Issue following command to get it solved:
Netsh DCHP add server <fqdn> <ip>

Open in new window

Error 1056 means that Dynamic DNS credentials are not configured

Following command should solve this:
Netsh DHCP set dnscredentials username domain password

Open in new window

Sajid Shaik MSr. System AdminCommented:
please check this article


all the best
kurajeshSenior Systems AnalystAuthor Commented:
i had unauthorised the 2008 and authorised 2012 many times

but still the issue is there , not leasing the ip

anyhow i will issue the above commands again

any other steps to follow
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kurajeshSenior Systems AnalystAuthor Commented:
i have done the above steps but still have the same issue.

i tried removing the dhcp role from 2008 and install the same in 2012 , restored the dhcp bkp in 2012. tried all the commands above but still not leasing any ip.

the moment i put it back in 2008 dhcp started working.
i even removed the dns role from 2012 and installed it again but still dhcp not working.

i need to resove this issue as iam in our main site (HO), hence kindly advice some additional steps to resolve the issue.

please ...
kurajeshSenior Systems AnalystAuthor Commented:
The issue with dhcp is resolved by doing the below

I disconnected the 2012 server from present network and connected to another switch with one workstation, installed dhcp and it worked instantly
Then I logged in to the core switch (cisco 3560) and found the entries as
#ip domain name (ip address of 2008 server)
Few vlans are also configured in switch and under each vlan I found the entry as
#ip helper-address (ip address of 2008 again)

I replaced the same with 2012 ip and dhcp started working from 2012 immediately.

Still iam not able to understand the concept is that entry helper-address means dhcp leasing in cisco
kurajeshSenior Systems AnalystAuthor Commented:
it is fine now
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