In all previous versions this worked for me.
My Verizon FIOS DVR (Media Server) allows watching basic non-encrypted live TV channels through any network connected DNLA/UPnP device. In v17.0 RC1 & 2 the server is found and all channel numbers displayed but when PLAY is pressed, there is a spinning circle and then back to the channel chart. I deleted the video source and entered it again with no luck.
The above is a Windows 10 Desktop
My 2 Intel NUC’s running OpenELEC 7.0 (Kodi 16.1) work properly with this UPnP source.