Server for NFS

Hi,

Actually I use a Win 2003 R2 as Server NFS
My AD is Win 2008 R2
My Client is an AS400 (V5R4)
I use AD lookup and it works fine.

I would like to create a new Server NFS with Win 2008 R2 ...

Mount and unmount are OK
But I can't walk down directories !

I'm surprised because I installed on my Win 2003 R2 :
- Microsoft Services for NFS Administration
- RPC External Data Representation
- RPC Prot Mapper
- Server for NFS
- Server For NFS Authentification
(May be I installed too options ..?)

And on my Win 2008 R2 I install :
- Services for Network File System

On my AD I installed :
- Identity Management for UNIX

NOT Installed :
- Server for Network Information Server
- Password Synchronisation

I was happy, it is more simple !
But it doesn't work !

What is the mistake ?
Thank you for your help.

Ludovic.