AWS ECS Fargate ALB Error (Request Timed Out)

Question

I have set up a Docker container running on port 5566 with a small Django application. The Docker image is uploaded into the ECR and later used by Fargate container(s).
I have set up an ECS cluster with a VPC.
After creating the Task Definition and Service, the Service starts up 2 tasks (as it is supposed to):

Here's the Service's Network Access (with health check grace period on 300s):

I also set up an Application Load Balancer (with DNS) with a target group for the service, but the health checks seem to be failing:

Here's the health check configuration:

Because the health checks are failing the tasks are terminated and new ones are started after ~every 5 minutes.

Here's the container's port mapping:

As one cannot access the Fargate container (via SSH for example) and the logs are empty, how should I troubleshoot the issue?

I have tried to follow every step in the Troubleshoot Your Application Load Balancer .

Feel free to ask additional information.

Answer 1

can you confirm once, your application is working on port 5566 inside docker?

you can check logs in cloudwatch. you'll get the link in cluster -> service -> tasks -> your task .

Can you post your ALB configuration? your Target group port?