Portmapper problems

[Moffat]

Could someone give me a clue as to what's wrong here - when NFS is started
on our 730 I get the following at regular intervals:
  Cannot register service: RPC: Timed out
  rpc.statd: unable to register (SM_PROG, SM_VERS, udp)
  Cannot register service: RPC: Timed out
  unable to register (NLM_PROG, NLM_VERS, tcp)
The command 'rpcinfo -p' produces:
  Cant contact portmapper: RPC: Remote system error - No route to host
which is the same as when portmap is not even running!  The 730 is
03.01.0001.0003.  A 320 (preinstalled system, same level) hangs when trying
to start NFS, but the other 320, which has only bos.obj, bosm..msgs, bosnet,
& X11 runtime, installed from an early system image (same level) of the 730,
works perfectly - 'rpcinfo -p host' on the other two produces a list of its
rpc entries!
When I first tried NFS out several weeks ago with 03.01.0000.0000 everything
was quite simple and straightforward.  I don't understand what happening
here - I've had a lot of trouble with tcpip but that's stable at the moment,
and I've done absolutely nothing (honest) with NFS except try to start it
using smit. (Oh, ps does show /etc/portmap as a running process)
Thanks in advance
-- 
    Graeme Moffat,                        Phone : +64 9 737 999  x8384 
    Computer Aided Design Centre,         Fax   : +64 9 366 0702
    School of Engineering,		  Mail  : Private Bag, Auckland, NZ
    University of Auckland		  Email : g.moffat at aukuni.ac.nz