When you try to activate your client machines having the operating system of Windows 7 or Windows Server 2008 R2 key management system you might sometimes get the error message of 0xC004F074 having the description that the key management system is unavailable. In some of the client machines this problem has been observed and the people have to face some difficulties. There are some reasons for this issue.
This kind of problem happens due to the mismatch of the support version which occurs between the client key management system and the host machine of the key management system. The host KMS is used actually as a Windows server 2008 host which is not able to activate the machines that have the Windows 7 or the Server 2008 R2. In the most common cases it has been seen that when the host KMS is running on the operating systems of Windows server 2003 or on windows server 2008 then this error message is usually seen and the client of the KMS is the Windows 7 or the Windows server 2008 R2. You would need to have an update in order to bring the host KMS running on the Windows server 2003 operating system. One update is also required for the host KMS to run on the Windows server 2008 operating system so that it should be able to activate the client KMS which are present on the Windows 7 or the Windows server 2008 R2 machines.
Resolution to this error message
When you are experiencing this type of error message then you can follow certain steps or methods to get rid of this. With the help of these methods you would be able to avoid this error message of the key management system being unavailable.
For windows server 2003
When your system is having the operating system of Windows server 2003 as the host of your Key management system then you would need to have the update. The update can be easily obtained from the support web site of Microsoft and you can easily install the KMS i.e. the Key management system version number 1.2 for the Windows server 2003 service pack 1 and also for the later versions of the operating system of Windows server 2003.
For Windows server 2008
When you need to have the update for the Windows server 2008 operating system you can contact the support from Microsoft and can easily find the solution to this problem from there. You would be able to find it in the Microsoft knowledge base. The update is also available for the Windows vista and also for the Windows server 2008 in order to extend the activation of the KMS support for the Windows 7 as well as for the Windows server 20098 R2.
This problem is seen in different versions of the Windows 7 operating system. For example in Windows 7 Enterprise, Windows 7 Enterprise N, Windows 7 Professional, Windows 7 Professional N, Windows 7 Ultimate and also in Windows 7 Ultimate N.