You have an Azure Container Instances container group named CG1 that has a DNS name...

Exposed ports on the public IP address of CG1: 443 only; Network endpoint for App1: localhost:5000

In an Azure Container Instances group with a public IP address, only the ports exposed on the container group public endpoint are reachable externally. The public exposed port should therefore be limited to 443. Containers inside the same container group can communicate with one another over localhost, so App1 can continue to reach container2 at localhost:5000 without exposing port 5000 publicly. For this domain, least privilege means granting only the required data operation or allowing only the required network flow. The correct response avoids shared keys, broad peering, general contributor roles, or log-only controls when the scenario demands prevention, routing, event triggering, or account-specific configuration. The result is a direct exam-style implementation choice: it changes the required security behavior without relying on unrelated monitoring, manual cleanup, or excessive privilege. Official Microsoft source/topic: SC-500 Study Guide > Azure Container Instances security; Microsoft Learn > container group exposed ports and localhost communication.

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