At my work, we have a tech that uses the expression “Let’s drop our pants and leave everything wide open” when he is trying to troubleshoot network/security issues. Basically, he turns off all security settings while troubleshooting the problems and gradually adds the layers of security back after he got the system rolling.
In your case, I am going to make the following assumptions:
1. You can watch the same ISO file sitting on a local device such as a flash drive(you said that you could)
2. You are able to watch the same ISO from another network shared folder such as Windows share? If you are a MAC user, I have no idea how to setup a share folder but I know it can be done. Here’s a link to show you how to set up a Windows XP share -
http://support.microsoft.com/kb/304040 I am sure you can search online to show you how to share other OS.
3. You are able to play other media files using “UPnP AV Server”. ( you said that on your first post). This tells me are you connected on the network. Incidentally, you cannot stream ISOs using UPnP AV is because ISO is not a media file type. Furthermore, as far as I know, you can only stream a very limited file types using UPnPAV. You can check the forum regarding streaming video using UPnPAV. Your WD Live TV plus is capable with a lot more. So, utilize the WD player to play the media files. Use the NAS as a file server. You can turn on UPnPAV later if you want to stream music etc. I just wouldn’t do it for video files.
4. You have the latest firmware for both devices (WD Live TV and DNS-321)
If you are able to do all that above, I have a feeling your problem is in the network access settings.
I can tell you when I got mine DNS-321, I popped the 2 hard drives in, connected to the network. During configuration, I left network access at default or in another words, I gave all users read/write access to the entire volume_1 of my NAS. I copied some test files into the NSA. I turned on my WD Live TV plus, I go to Videos - Network Shares – My NAS the player found my NAS, I opened the folders in there, I see all my files and I was able to play them.
Back to you, here’s what I would do. Go to Network Access, under your SMB access list and delete everything in there, Next under Network Access Settings, Type = SMB, Category = user, User (CHECK THE BOX ALL ACCOUNT), check on Browse and click on the “root” of your volume_1 (whatever you called your NAS volume during setup), READ AND WRITE permission, now click Save settings.
Logout.
Go to your WD Live TV plus, go to Settings – Network – Clear Login Info for Network Share.
Now go back Video – Network Shares – your Dlink DNS321 – it may take a few seconds, you should see your root folder. Once you see that, browse to the folder with the ISO file and play that bad boy.
Once you are able to play the ISO file, it is time to put the pants back on by adding security back to your NAS box. Good Luck.