Universal Media Server | Forum

Can you confirm that your computer running UMS has an IP address of: 10.23.1.116
Also, perhaps try uninstalling UMS and try an earlier version (V12) of UMS.

A search on the internet (search: universalmediaserver java avast) finds several issues like yours.
Some reported that uninstalling java and installing java again fixed the issue.
viewtopic.php?t=6133

Quite some users have had this problem because of different subnets as mik_s says.
A quick way to check is to look at your TV and check what IP address it is using and look at your computer and check what IP address that is using.

I would think your USB2 drive is fast enough.
A USB2 drive can do 480Mbps and your TV can only do 100Mpbs.
If... The USB2 drive is operating OK.
Maybe you can do a speed test on your USB2 drive.

Also you need to attach your log file:
Like this: viewtopic.php?f=9&t=556
After putting UMS into trace mode, play one of the files giving problems and then post the logs.
Take UMS out of trace mode afterwards.

Can you post the renderer configuration file.
Likely: LG-WebOS.conf

It sounds like maybe your video files were previously streaming and now transcoding.
To test go into the transcoding folder for the videos in UMS and choose "No Transcoding" and check if the vidoes can be played.

I notice that your default LG-WebOS.conf does not include streaming for FLV video files. I have had my LG-WebOS.conf file set to stream FLV video files for a few years and it works fine on the 2 LG TV's I have. Perhaps it could be added to the default LG-WebOS.conf file. Supported = f:flv v:h264|mp4...

I do mine like this which works fine:
seriesName S01E01-E03.mkv (I use a space rather than the dot in the filename).

I don't have any series with 2 episodes that cross season boundaries, but I think this would work fine:
seriesName S01E22-S02E01.mkv

Green linuxer giving it a spin on my headless Ubuntu 20.4 file server I've been running UMS on a Gentoo Linux headless file server for many years and it works fine. One of the renderers I use is a Yamaha AVR which also works fine so I think you should be OK with your Denon AVR. The Denon conf file ...