Sgi File systems do not automount on ultrix

[Lyle Meier]

We have a decssystem 5840 running ultrix 4.1 and a sgi 4d/25 and 43/310
running 3.3.2. It is possible to mount the ultrix file systems on the
sgi using automount, but it is not possible to mount the sgi file
systems on the ultrix machine. However if a hard mount is done 
it is possible to perform this task.
When the automount is tried from ultrix the message permission denied
appears along with the message no such file.

Any ideas where the problem may lie. The SGI hotline has been no help,
I recognize that this problem lies sort of between vendors. 
With suns the sgi file system automount ok.