The site contains one or more domain controllers, but it is not connected by any site links. This site cannot replicate with other sites unless they are connected by site links.
Sample Event:
The site %1 contains one or more domain controllers, but is not connected by any site links. This site cannot replicate with other sites unless they are connected by site links.
For more information, see:
Microsoft Help and Support for Microsoft Windows Server 2008 and above
Microsoft Knowledge Base