NFS denied from esx server

Hi,

I am trying to mount a NFS share from a VMware esxi 4.1 and I am getting access denied message in the log on the vmware host.

I have setup the NFS share on a Windows 2012 with these settings.

Authentication: No server authentication/Enable unmapped user access/Allow anonymous access

Share: All Machines Read/write. Allowed Root access

NTFS: Everyone Access Modify

Thanks