Like i wrote to you in private this is not fixed yet, When setting manually port in plex “IT SHOULD” try to upnp it self but it does not, and IT does not responds to routers on that port it is still broken, I have tested with 3 different routers now 1 asus, 2 netgears its NOT working.
Manual set port, delete any port forwards for plex, look it fail at automatic port mapping for manually selected port setup
