Unable to mount an NFS share I'm trying to access my (Synology) NAS share through NFS and always get the same issue.  

First, I activated NFS support in my NAS:


Then I set the permissions on the NAS:


My MBP has the IP 192.168.1.109.
From there it seems OK. a showmount -e 192.168.1.2 shows the list:

Exports list on 192.168.1.2:
/volume1/video                      192.168.1.109
/volume1/homes                      192.168.1.109


But unfortunately, my mount always fails:

GroundControl:/ ludo$ sudo mount -t nfs -o rw 192.168.1.2:/volume1/homes /Volumes/home
mount_nfs: can't mount /volume1/homes from 192.168.1.2 onto /Volumes/home: Operation not permitted


The /Volume/home directory is created upfront.

Trying with a non-existing share on the NAS, for example /volume1/qwerty gives a Permission denied error, which is OK.
But what is this Operation not permitted error?

Trying through DiskUtils>NFS Mounts gives the same result.

What did I miss?
Or just use the "resvport" option with the mount command.

mount -o resvport nasbox.local.com:/try /mnt