Ok, I don't have the origional post in my email so I am replying via a reply cutting and pasting from the archives list web page. > Looks like just starting the nfs service turns on V2, 3, and 4 (based on reading the script, reading the man pages, and looking at the ports using netstat -l). That behavior is set in the /etc/sysconfig/nfs file > I don't believe this is a firewall issue, internal IPs are fully open to each other according to an early rule in iptables. It may not be a firewall issue, but NFS does use a different port. port "2049" You got yourself a configuration issue! So, this is what I did: On the server, in /etc/sysconfig/nfs be sure you set: SECURE_NFS="no" until you are ready to take on kerveros authentication. While you are there you can change which versions of NFS get mounted. I haven't had to change anything else in that file. Next, on both the sever and client, go into the /etc/idmap.conf and be sure to set your "Domain =" to your domain name. and also set: Nobody-User = nobody Nobody-Group = nobody Now for the /etc/exports file Lets say you keep everything in a /export directory. In there you have a home/ and a data directory... Well, the export file should look something like: /export 192.168.0.*(rw,fsid=0,no_subtree_check,insecure,sync) /export/home 192.168.0.*(rw,no_subtree_check,insecure,sync) /export/home 192.168.0.*(ro,no_subtree_check,insecure,sync) Notice that the flags are different. Not the fsid=0 flag? Well that defines the /export as the "root" NFS directory so you do not need to included "/export" in the fstab or the mount string when mounting. There can be more than one fsid flag as long as the numbers are unique but only fsid=0 sets the root directory. Other numbers allow different kerberos setups, or so I understand. Remember to restart NFS on the server! Now to finish with the client, be sure you did the /etc/idmap.conf on the client or you will get all sorts of strange results! Edit the fstab file If you want to mount just /export on the server to /mnt/nfs on the client the fstab entry would look like: server.dom:/ /mnt/nfs nfs4 rw,soft,intr,proto=tcp,port=2049 0 0 Notice there is NO /export . That is because of the fsid=0 flag. If you included the /export it would deny the mount. To mount the two directories: server.dom:/home /home nfs4 rw,soft,intr,proto=tcp,port=2049 0 0 server.dom:/data /mnt/data nfs4 rw,soft,intr,proto=tcp,port=2049 0 0 again no /export