In a restricted environment, i.e., an environment where the administrator controls root access, you can enhance NFS security by setting the "NFS_PORTMON" variable. This variable is set in /etc/system, like this:
* Prior to Solaris 2.5 set nfs:nfs_portmon = 1* Solaris 2.5 and later set nfssrv:nfs_portmon = 1