Meu problema surgiu do fato de que eu estava batendo
my.aws.pub.ip:32400
O URL correto para acessar é my.aws.pub.ip: 32400 / web / index.html ou my.aws.pub.ip: 32400 / web, a menos que você tenha configurado algum tipo de proxy reverso para instruir a AWS a enviar todos os pedidos nessa porta para o PMS.
Aqui está o que eu originalmente perdi na documentação do PMS.
If you installed the Server on a device like a NAS, or the Server PC is somewhere else in the house, you'll need to know the Server's internal IP Address. Once you know that IP address, on a PC in your home:
- Open a browser window
- Type http://server.local.ip.address:32400/web into the address bar (e.g "http://192.168.1.5:32400/web")
- The browser will connect to the Server and load Plex Web App
In cases where you're installing Plex Media Server on a remote system, you'll need to first connect to it so that you can access it as if the system were local. Please see information in the Installation article for details.
https://support.plex.tv/hc/en-us/articles/200264746-Quick-Start-Step-by-Step