Very Computer

Hi,
I tried mounting an exported filesystem from Ultrix 4.3 on a Solaris 2.4
X86. I frequently get the message "nfsserver not responding still
trying".
On the sunsolve CD from April 95 a simular problem was mentionned with
HP-UX and AIX machines as server. The proposed solution of :
a) set nfs:nfs_portmon=0
   set nfs:nfs_fastpath=0      in /etc/system
b) no more then 6 groups for the root account.
does not work for me.Furthermore, I get the message "Sorry, nfs_fastpath
is not defined in the nfsmodule" at system startup.
Does anyone has a better solution?
Thanks.