We are using private cluster. I could mount nfs folder from the Pod using mount command but when I mount it using volume I got Connection Refused:

volumes:
  - name: nfs-share
    nfs:
      path: /mount
      server: my.nfs.com

Mounting command: systemd-run
Mounting arguments: --description=Kubernetes transient mount for /var/lib/kubelet/pods/bd7c2a60-64e7-4423-b6b8-7b4621f2015e/volumes/kubernetes.io~nfs/nfs-share --scope -- mount -t nfs my.nfs.com:/mount /var/lib/kubelet/pods/bd7c2a60-64e7-4423-b6b8-7b4621f2015e/volumes/kubernetes.io~nfs/nfs-share
Output: Running scope as unit run-211758.scope.
mount.nfs: Connection refused

I'm confused what's the difference between those mounts and wghat could be an issue? The mount command from Pod is the same, FW rules and NetworkPolicy are in place.