NFS Services Administrator's Guide

Troubleshooting NFS Services
Common Problems with NFS
Chapter 8296
If you were attempting to run a program when you received the
“permission denied” message, issue the ls -l command on the NFS
server to check whether the program you tried to run has the setuid
bit set. If it does, check /etc/fstab to determine whether the
directory was mounted with the nosuid mount option. If necessary,
remove the nosuid option from the /etc/fstab file, then unmount
and remount the directory.