Some pointers in setting up NFS

General Setup

http://www.tldp.org/HOWTO/NFS-HOWTO/server.html

Permission Denied

http://www.linuxforums.org/forum/linux-networking/44779-nfs-permission-denied-error.html

http://www.linuxquestions.org/questions/linux-general-1/nfs-mount-permission-denied-343839/

You need to try restart some services to make it work... at least for me.