Permission denied-error on TFTP-service (but file is set on 777...)

Hi there

seems there is nearly no action in the tftp-section, but I'm struggling hard with this.

Goal: network boot for 5x raspi 4b (RaspOS lite 64bit)

- installed OMV (Hostname: omvNAS, Version: 7.0-24 (Sandworm), Kernel: Linux 6.1.0-17-amd64); IP: 192.168.1.2

- activated nfs and tftp

- nfs-share for boot/rootfiles is "Cluster" --> there are separated dirs for root- (named by hostname) and bootfiles (named by raspi-serial-no.)

- files are synced to the folders from the raspi

TFTP-options in tftpd-hpa (I edited everything in the omv-gui)

# This file is auto-generated by openmediavault

# WARNING: Do not edit this file, your changes will get lost.

TFTP_USERNAME="tftp"

TFTP_DIRECTORY="/srv/dev-disk-by-uuid-7dfc78e3-b019-4f8b-be42-7b9d182eed77/SNAS/Cluster/"

TFTP_ADDRESS="0.0.0.0:69"

TFTP_OPTIONS="--secure --blocksize 512 --retransmit 1000000 --create --verbose,--permissive"

Error: starting the raspi shows the IP of the tftp-server, but also a "file not found" error

what I tried:

- I'm able to connect to the tftp-server from my desktop. but I can't download a testfile. I can upload a testfile.

$ tftp 192.168.1.2
tftp> put test.txt
tftp> get cluster.txt
tftp: cluster.txt: Permission denied
tftp> get cluster.txt
tftp: cluster.txt: Permission denied

on the OMV the permissions look like this:

(I already used chmod 777 on cluster.txt, after it did not work with 644
and I even added the tftp-user to the users-group )

# ls -l
insgesamt 12
drwxr-sr-x  3 root users 4096 21. Jan 11:32 07535901
-rwxrwxrwt  1 root users    8 21. Jan 11:32 cluster.txt
drwxr-xr-x 18 root root  4096 21. Jan 11:33 piCluster05
-rw-rw-rw-  1 tftp users    0 21. Jan 13:02 test.txt

Don't see why this is not working!

What I couldn't try was to delete the "--secure"-option as this seems to be set by the omv-default when starting the tftp-server.

Who knows about this?