This post to help you understand how to use the DFSDIAG.EXE tool to check your DFS-Namespaces (DFS-N) configuration. DFSDIAG was introduced in Windows Server 2008 and it was improved in Windows Server 2008 R2 to provide better messages and help text. DFSDIAG can check your configuration in five different ways: Checking domain controller configuration  – Checking site associations – Checking namespace server configuration  – Checking individual namespace configuration and integrity  – Checking referral responses

Full Article: Jose Barreto