4K Buffering over the same Network?

[Volts]

First, view the Plex dashboard while something is playing to confirm that it is not being transcoded.

Then take a look at this thread and especially this post. There are specific interaction issues with Windows Server and the Apple TV 4K.

Enhanced Video Player on Apple TV 4K creating buffering issues

After stumbling upon this buffering issue myself on an iPhone after a recent in-place upgrade from Server 2016 to 2019, I did some digging. Looking at a packet capture in Wireshark of a buffering stream, I noticed frequent TCP Retransmissions during that time and the RTO was 20ms. After some research, I came across the Get-NetTCPSetting PowerShell command and found a very familiar number there. (Hint: It’s 20) PS C:\WINDOWS\system32> Get-NetTCPSetting | ft -AutoSize SettingName Congestio…