RSync permissions ERROR CIF share

[readypat]

Dear All

The permissions errors appeared I think after the update to the newest firmware version.

The source and target NAS are:
ReadyNAS 2100
RAIDiator-x86 4.2.22

My fstab entry looks like this on the source NAS
//192.168.x.x/backup /mnt/pdzhnas2_backup cifs username=xxx,password=xxx 0 0

My rsync command to copy the files are:
rsync -az $SOURCE --bwlimit=$C_SPEEDLIMIT_KB --partial --delete --stats $TARGET >> $C_LOGFILE

Now I get following error message:
rsync: chown "/mnt/pdzhnas2_backup/Test/." failed: Permission denied (13)
rsync: chgrp "/mnt/pdzhnas2_backup/Test/cool.txt" failed: Permission denied (13)

Before it always worked like a charm. What could be the problem?
It seems that I can't set permissions anymore on the target share but it is still possible to copy files over.

I'm happy about any information. Thank you very much.

[readypat]

For the time being I rscyn with -rltD instead of -a. It means it copies everywithing without the permissions. But does really nobody now where the problem could be?

[a_burger_with_f]

what firmware version were you on prior when it was working?

[readypat]

I used the version:
RAIDiator-x86 4.2.19