My DS920+ was a bit hit or miss when trying to use it with my Samsung smart TV. It was appearing as a source device for a long time and then disappeared. I tried everything to get it to back with absolutely no luck. It appeared on every other device on my home network ( mostly hard wired), just not the TV. This was not a DLNA problem. I finally found the answer in an old forum discussion. But, given all of the questions and lack of answers that are still occurring on forums, I thought I would pass this along.
The problem was with the router. In my case, an Asus RT-AC68U. I went to the router's firmware settings; specifically : the LAN / IPTV tab and set the "Enable Multicast Routing" to "Enabled". I also enabled the Efficient Multicast Forwarding for good measure. The problem went away instantly. On the DS920+ the TV showed up in the Device List of the Media Server app and the NAS appeared as a Source on my Samsung TV. From an obscure forum post to instant cure was quite remarkable. This just doesn't happen that often for me. I hope someone else can benefit from what I found.
The problem was with the router. In my case, an Asus RT-AC68U. I went to the router's firmware settings; specifically : the LAN / IPTV tab and set the "Enable Multicast Routing" to "Enabled". I also enabled the Efficient Multicast Forwarding for good measure. The problem went away instantly. On the DS920+ the TV showed up in the Device List of the Media Server app and the NAS appeared as a Source on my Samsung TV. From an obscure forum post to instant cure was quite remarkable. This just doesn't happen that often for me. I hope someone else can benefit from what I found.