Not able to connect to servers



I have been using plex for a while on my Samsung smart hub, connecting to servers located on Windows 10 machines.

For a few days now, i am not able to connect to any of my servers and getting a red X next to the server name - plex is online.

i have no problem connecting to the servers from one another and on Roku or other media streamer.

i have tried reinstalled the app on the TV and on a server without change. network security on the server is marked as preferred.

not sure what else to do... any advice is appreciated.