Hi SquareFish25 ,

I am using HTTP at the moment because HTTPS doesn't work, how should I change the rules?

You can setup the AWS ELB to handle that, if you'd like. See https://allegro.ai/docs/deploying_trains/trains_server_config/#sub-domain-configuration

How can I restart the Trains Server on EC2?

For what purpose? If you want to reload configuration etc., you can simply do docker-compose down and than docker-compose up from the folder containing the docker-compose.yml .
You can also restart the EC2 instance while the docker-compose is running, but it takes longer and has the same effect 😄