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When you run the Active Directory Administrative Center (Dsac.exe) and then select the "Change Domain Controller" command, many domain controllers are listed as in an "Offline" status. However, when you examine those domain controllers, you find that they are online, that they are available over the network, and that they are operating correctly.
Only domain controllers that are running Windows Server 2008 or Windows Server 2003 are listed as in an "Offline" status. Domain controllers that are running Windows 2000 Server are not listed at all.
This issue is expected behavior when the out-of-band (OOB) Active Directory Management Gateway Service component is not installed on a computer that is running Windows Server 2008 or Windows Server 2003. This component is a version of the Active Directory Web Services interface that exists on the domain controllers that are running Windows Server 2008 R2 after Active Directory Domain Services is installed.
To resolve this problem, download the Active Directory Management Gateway Service component and install it on all domain controllers that are running Windows Server 2008 or Windows Server 2003. After the component is installed, verify in Services.msc that the "Active Directory Web Services" service is started and that it is set to the "Automatic" setting.
To work around this problem, do not use Dsac.exe to connect to domain controllers that are not running Windows Server 2008 R2 or Active Directory Management Gateway Service.
For more information, visit the following Microsoft Web site:
Active Directory Administrative Center
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