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The EC2 instance security groups allow inbound traffic

The network ACL on the subnet seems to be completely open

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No ports listed but I’m able to connect to the management UI.

I guess I don’t understand how ECS port mapping works with load balancers

So I am assuming this is EC2 based ECS, which should work similiar to K8. So your port mapping would be say 3000:80, hostport 3000, which would map to your NLB Port. and that proxies to 80 of your container

So since that rabbitmq service doesn't expose a host port I assume your services within the same cluster can communicate over the service discovery name + container port, so long the ACL/SG's allow that communication inbound and outbound