DLNA playing shared sources

Server Version#: 1.20.4.3517
Player Version#: Sony BDP-S580

Greetings, I am seeking some advice on a potential issue (but maybe not an issue, maybe just not supported) that is happening. I am attempting to play, via DLNA using the DLNA features of a BDR player, files that are not local to my server but are shared and on a friend’s server. I can see the content listed for the shared videos on my friend’s server via the DLNA get request but whenever I go to play the file it fails with a general “File is corrupt or not supported” error. These same exact files will play properly when placed on my local PLEX server and played using the same DLNA player. Is this something that should be supported or not? Thanks very much.

see Access to Remote Plex Server using DLNA through Local Plex Server