windows server 2012 R2 DHCP service Stop working

My MDT sever which is also a DHCP .I renamed that server and since then Client are not gettign IP addres .
Server is 2012 R2 Standard.Any idea why  Clinets not getting IP address after getting server renamed ?
This server  is not attached to AD or DNS. it's an isolated server for imaging  to use MDT.
Thaks in Advance
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Gopi RajuSystem EngineerCommented:
Did you authorized the DHCP server. it should be authorized.
wajhiuddinAuthor Commented:
When I try to authorize . I get a mesage "DHCP server could not connect to Active Direcory"
This is an isaolated server.Not connected to AD
Olivier MARCHETTACitrix Support and Infrastructure EngineerCommented:
Do you have any other DHCP server on the same LAN ?
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wajhiuddinAuthor Commented:
no  i't an isolateed server cooonected to a singel swithc and thats it
Olivier MARCHETTACitrix Support and Infrastructure EngineerCommented:
Check your firewall settings.
Is your network zone in public or private ? (can't be domain if you are not domain joined)

Try removing and reinstalling the DHCP role if the network and firewall are Ok.
When you remove the role, delete manually all files in c:\windows\system32\DHCP
Reinstall the role and reconfigure the DHCP.

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wajhiuddinAuthor Commented:
I am not sure whats happening , But unplug a swithc and connected a router which has DHCP enabled. Did Deployment process .
Unplugged router( after finising up deployment)  and plugged in to the same swithed and I see HDCP started working :) :)
Not sure how reliable this server is put it on production. But it works now

wajhiuddinAuthor Commented:
Thanks for your help
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