NFS mount problem on f7 from fc5

[Allen Kistler]

Basically I can't mount an fc5 export on f7-test.  Is anyone else seeing
this problem?

The error message I get in f7 is:

# mount -t nfs -v ack603:/var/ftp /mnt/nfs
mount: wrong fs type, bad option, bad superblock on ack603:/var/ftp,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

I mount my ftp directory from other machines (fc5, fc6) all the time.
/var/log/message doesn't contain anything at all on the error.  The
error occurs straight "out of the box" (the test dvd) and after updating
everything to rawhide.

The export machine is fc5 with all the latest rpms.  Portmap is running.
 There is no netfilter to get in the way anywhere.  Am I missing
something?  Clues welcome.