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The most important step to re-enable NFS is to apply all
updates to your system as detailed in the Installation/Update section.
After installing the updates, run as root:
# /sbin/chkconfig portmap on
# /sbin/chkconfig nfs on
# /etc/rc.d/init.d/portmap start
# /etc/rc.d/init.d/nfs start
You'll also need to make sure you are using the Stanford Default
firewall setting in the /usr/sbin/sulinux configuration program.
RedHat's settings disable inbound RPC packets by default and you must override
this in /etc/sysconfig/ipchains or use the sulinux program to do
this for you.
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SULinux Faq-O-Matic : 
How do I re-enable NFS?