Help : NFS on Ubuntu will not mount N5200

Hi

I have a N5200 with NFS enabled that I mount onto two linux machines.
The first is running Fedora Core 6, with this in /etc/fstab

crate:/raid/data/data /data nfs rw,tcp,soft,vers=2,nolock,rsize=8192,wsize=8192 0 0
crate:/raid/data/cad /cad nfs rw,tcp,soft,vers=2,nolock,rsize=8192,wsize=8192 0 0[/SIZE]

where "crate" is the N5200 device. On the fedora box this works fine.
However, on my Ubuntu box

victoria:~/p4/sw/core> uname -a
Linux victoria 2.6.20-16-generic #2 SMP Wed May 23 01:46:23 UTC 2007 i686 GNU/Linux


I get this everytime I do mount -a

root@victoria:/home/sam/p4/sw/core/verilog# mount -a
mount to NFS server 'crate' failed: possible invalid protocol.
mount to NFS server 'crate' failed: possible invalid protocol.

Any hints you can give me? It has worked at times from this machine,
but I think a few upgrade releases of Ubuntu have come into the machine
and it seems to have destabilized it.

Sam

On N5200 NFS share folder
Hostname:*
Privilege:Writable
Root Access: No

On UBUNTU
thecus@thecus-desktop:/home$ uname -a
Linux thecus-desktop 2.6.20-15-generic #2 SMP Sun Apr 15 07:36:31 UTC 2007 i686 GNU/Linux

thecus@thecus-desktop:/home$ sudo mount 172.16.66.63:/raid/data/public NFS
thecus@thecus-desktop:/home$ df
Filesystem 1K-blocks Used Available Use% Mounted on
.
.
.
/172.16.66.63:/raid/data/public 4724199648 2230528 4673199872 1% /home/NFS
thecus@thecus-desktop:/home$


Seem N5200 could mount folder on UBUNTU, but first mount would take about 1 min.....

I guess my ubuntu distribution is wierded out. I still get the same message.
I don't think it's a thecus problem since Fedora mounts it fine, and reliably.

thanks for your help.