Created attachment 12647 [details]
DFS Namespace Domain Based
On actual version of Samba AD is impossible to create DFS Namespace like Domain Based. It will always fails with error: "The namespace cannot be queried. The RPC server is unavailable."
Checking or unchecking compatibility with Windows Server 2008 has no effect for that.
But creating Domain Host DFS namespace work, probably because of that didn't use AD.