Consider the following scenario. You try to create a synchronization connection to a domain in Microsoft SharePoint Server 2010. The domain contains an organizational unit (OU) that has the same name as the domain. In this scenario, when you populate the containers in the tree control, the OU node cannot be expanded or selected. In this instance, the OU that has the same name as the domain cannot be synchronized.
To resolve this issue, apply hotfix 2276342 . Server restart is not required for instalation of this hotfix.