The only way that I could get this to work was to set the DNS-321 to the factory defaults and then add the permissions that I wanted. I did not delete the default "ALL" permission. I added a new permission to my media folder with All Users set for R/W access. I then changed the Volume_1 R/W access to Read Only so it could be read, but not changed.
It appears that when you delete the Volume_1 "ALL" access, the DNS-321 then requires passwords on all access. I could be wrong about this as I did not spend a lot of time with it.
The problem with the perrmissions comes about if you reboot/restart the DNS-321 - you may loose your permissions. If you save this configuration and then try to re-load it, your permissions may be lost in certain circumstances and you will have to start over with the default configuration. It even looses the Volume_1 "ALL" permission. This appears to be an issue with certain configurations of RAID. I have this problem and I am using two 250 Gb drives in a RAID 0 configuration.
In order to deal with the permissions disappearing on a reboot/restart I do the following procedure:
- Set DNS-321 to default values.
- Set up network, FTP, UPnP, iTunes server, and all other paramaters except for the permissions. Leave the initial Volume_1 "ALL" permission.
- Once I have all that working, I save the configuration. This will allow the configuration to be re-loaded and at least have a decent starting point. Save this on the local drive because you won't have access to the NAS files until the configuration is reloaded because the Volume_1 "ALL" permissions is gone.
- I then set my permissions the way I want them and I'm done.
If the DNS-321 is rebooted/restarted, you will have to re-load the basic configuration and then re-set your permissions. A bit of a pain, but it does work. My DNS-321 is on a UPS so it does not shut down.
I'm hoping that D-Link will be able to troubleshoot this and help us solve this issue. Other than this one problem, I am quite happy with the DNS-321. It serves my purposes quite well.