
The DNS entry that is needed can be tested with the nslookup tool:

Check that the "Software Protection" (sppsvc.exe) service is running.Access the Windows 2008 R2 Server that you have chosen as the KMS server.So the only possibility left is to activate over the phone, which is a bit a cumbersome process, which I will describe here: But many company don’t allow direct Internet connections to server for security reasons. The KMS server is the only server that needs to connect to Microsoft over the Internet once.

You cannot only activate Operating Systems such as Windows 7 and Windows 2008 R2, but also other applications from Microsoft such as Office 2010 with a Volume License.

One or more KMS Servers can be used inside the company to activate all clients.

For Enterprises, Microsoft has created a central licensing system to avoid the need of every company PC to connect to Microsoft Servers on the Internet to activate the software.
