ACL error on ls. eh?

root@solaris: $ ls -la /nfs/mnt 
ls: can't read ACL on .: Permission denied

sigh.

root@solaris: $ mount -F nfs -o vers=3 server:/nfs/export /nfs/mnt
root@solaris: $ ls -la /nfs/mnt 

... stuff ...

cool

why?  nfs client default mismatch.  solaris was saying 2.  server was saying i'm 3 all the time.