Connection problem to the broker

We have a lorawan system (NW + APPS) deployed with Docker on an EC2 (AWS). We installed node-red on this EC2 instance (in docker) and locally on a machine. We are unable to connect to the brocker from node-red installed on EC2 while the connection is effective when we are using node-red locally. I would like to know what are the possible causes of this problem and how I can solve them? How should I proceed with the security keys (certificates, etc.)?

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