Can mount but have no permission to do anything

[joeri Belis]

Hi,

I have exported on the server 

/nfs4                   *(rw,fsid=0,insecure,no_subtree_check,nohide)

I can mount perfect on the client

mount -t nfs4 198.9.200.237:/ /mnt/vmdebian2/

But I have no read/write access , not even as root on the client??

What am I doing wrong?