can't seem to nfs mount from 1 machine to another....

on wayne:

/etc/exports has:
   /usr -maproot=root ip.addr.for.ballast

then I did 
  kill -HUP `cat /var/run/mountd.pid`

on ballast, I try:

  mount -t nfs wayne:/usr /tmp

and get (after many seconds):

NFS Portmap: RPC: Port mapper failure - RPC: Timed out


hmm.  both machines use amd to successfully nfs mount filesystems from
some other machines.

I must be doing something stupid, but I dont' know what.

Any suggestions?

Thanks

-Dan