Do nfsd run on the server? If not then start them. There is a bug in
   /etc/rc - the calls of the nfsd is wrong. It sould be
	   nfsd -tu -n 4

   instead of 
	   nfsd -u 0,0,4 -t 0,0,6 (or so)

   At least what nfsd tells me if I call it ..

Um, looking at /usr/src/etc/rc, I see:

        echo -n ' nfsd';                nfsd -tun 4

That looks right to me.

The incorrect invocation you mention is the syntax used in Net/2 and
NetBSD <=0.9.  If you still have it in your rc script, then you didn't
properly merge the 1.0 /etc files.