I've got Traefik set up with other services working correctly... and Plex works through the app but when trying to access via browser I get 502 bad gateway, and the Traefik log shows dial tcp 127.0.0.1:32400: connect: connection refused. All apps including Traefik and Plex are in their own containers.
Figured this out had a typo in the network config for the compose file. Thanks!