The Active Directory Management Gateway Service could be referred to as the Active Directory Web Service (ADWS) for Windows Server 2008 and Windows Server 2003. Why? Well, Windows Server 2008 R2 domain controllers have a built-in service called the Active Directory Web Service and the Active Directory Management Gateway Service is the implementation of that service that can be installed on Windows Server 2003 and Windows Server 2008. You can read more about these services and their purpose in the article What’s New in AD DS: Active Directory Web Services.
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