NFS: no security, but access denied

[x]

I'm setting up a combined firewall & network server running RedHat 7.2.
hdb1 is to be mounted as /home on all workstations, but mounting fails.
The message reads: "mount: 192.168.30.1:/misc /testdir failed, reason given by server: Permission denied"
During the installation of RedHat I chose "high security" since it's going to be a firewall (sometime in the future...) Now I have removed every security I can find, first manually flushing ipchains, then running lokkit (the program that sets up firewalling during installation) again and chose "no security".
I've checked ipchains - no rules set, policy accept.
There's nothing in /etc/hosts.deny, I tried adding ALL:ALL to /etc/hosts.allow - no change.
I tried mounting this from the server (to itself), got the same message so it's not the workstation that blocks.
xinetd does not list nfs, shouldn't it?
# nfs status returns:
rpc.mountd (pid 960) is running...
nfsd is stopped
rpc.rquotad (pid 955) is running...

Why is nfsd stopped? This is after restarting nfs, nfs is to be started at boot.
Could this be the cause - message says "permission denied", but then you can't always trust an error message.

[x]

After having written the question, I started to think about the nfsd problem.

# Modprobe nfsd
gave me a lot of error messages, there is obviously something wrong here.
I have lost ipchains too now, I believe the installation of RedHat is broken.
This is not a security issue after all, I'll reinstall RedHat.