SOLUTION: Conversion failed. The transcoder exited due to an error

[sa2000]

@JamminR

If Xenon’s answer is ‘correct, requires full disable’, then disabling web protection temporarily is a work-around, not a full term solution.
To me, that would be like Plex asking me to leave my house doors unlocked while I’m away so my Plex users could watch Plex.

It is just a matter of whitelisting all the Plex Media Server .exe files. A support article is being written to cover that