Does anyone know if OpenVMS uses a range of ports when trying to do
remote NFS mounts?

We're running DIGITAL TCP/IP Services for OpenVMS Alpha Version V5.0A
- ECO 3 on OpenVMS 7.2-1.

We're trying to do a remote NFS mount over our WAN and it's passing
through a firewall which we are currently changing each time we need
to remount these drives, because it continually picks a different port
to use.

This is the command we are using for the NFS mounts:

UCX MOUNT DNFS25:[000000] /HOST="PRODNFS.ARGUS.DSTSYS.COM" -
/PATH="/oti_nfs/reports"

Any suggestions would be appreciated.