Windows Server 2008 R2 activation via KMS failure

Hello,
I'm trying to activate about 20 Windows Server 2008 R2 via KMS. Before that I have successfully activated Windows 7 clients and Microsoft Office 2010 products. But when I try to activate Windows Server 2008 R2 clients via kms I'm getting the following error
on the KMS host:
. Exception System.Runtime.InteropServices.COMException (0xC004F074)
KMS host installed on the machine with Windows 7 Professional OS. From the VAMT GUI I can see the following Windows server license information :
Key Type : CSVLK
Edition : ServerStandard;ServerEnterprise;ServerWeb;ServerHPC
Description : Server 2008 R2 Std and Ent Volume.
If I try to activate product from the client I get the following error :
Error: 0xC004F074 The Software Licensing Service reported that the computer could not be activated. The Key Management Service(KMS) is unavailable.
I have searched a lot about this error. But still cannot solve the issue.
Thanks & Regards
Ulzii

Yes KMS host is Windows 7. I read all documents about KMS but haven't read this doc. So I have to change KMS host or add Win Server KMS host, that's right?
Yes that's right. Windows "Client" OS editions, when setup as KMShost, cannot issue activations for Windows "Server" OS editions.
To do so, you will need a KMShost product key for Windows Server - you will only have such a product key if you have purchased Windows Server licenses through Volume Licensing.
(The Windows 7 KMShost product key cannot be installed on Windows Server OS)
http://social.technet.microsoft.com/wiki/contents/articles/22510.volume-activation-kms-mak-adba-avma.aspx
Don
(Please take a moment to "Vote as Helpful" and/or "Mark as Answer", where applicable.
This helps the community, keeps the forums tidy, and recognises useful contributions. Thanks!)

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