I am running an ubuntu server in my LAN. Streaming videos and music was done with mediatomb but it looks like the server denied sending UHD videos. I also tried MiniDLNA but ended up with the same problem.
As testing devices I used an LG 55UF6809 and an older Panasonic TV, which has no UHD capabilities but was still unable to play the video. That made me think the issue is probably with the Server and not with the TVs. UHD content from Netflix plays fine.
The server is an HP ProLiant MicroServer Gen7. The network is definitely fast enough to stream content. The files are stored on a WD Red, if that matters. Playing the files on a PC over Samba or NFS share works well too.
Any ideas on how to stream UHD videos within my network?