NFS connection issue

I have the following issue:
My media files are on the FreeNAS server shared by NFS.
The server allows non-privileged connections and I used to connect it to my old phone; Kodi used to be on version 16 when I installed it.
I upgraded my phone to Samsung 8s and installed Kodi, now it has version 17. But Kodi did not work with NFS. To be more precise it worked as the non-privileged connections are disabled (showed only NFS root directories but couldn’t access them).
I checked my old phone (it was upgraded to Kodi 17); it connected to the directories without problems.
I uninstalled Kodi 17 from my new phone, installed Kodi 16 – and now it connected. I upgraded it to Kodi 17 – and now it works.