# Amazon ECS service unhealthy event messages
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The following are examples of service unhealthy event messages.

## EC2: (service {{service-name}}) (task {{task-id}}) (instance {{instance-id}}) (port {{port-number}}) is unhealthy in (target-group {{target-group-name}}) due to (reason {{failure-reason}})
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This message indicates that a task running on an EC2 instance is failing health checks. For more information, see the following:
+ [How do I get my Amazon ECS tasks that use EC2 to pass the Application Load Balancer health check?](https://repost.aws/knowledge-center/troubleshoot-unhealthy-checks-ecs)

## EC2 with taskSet: (service {{service-name}}, taskSet {{taskSet-id}}) (task {{task-id}}) (instance {{instance-id}}) (port {{port-number}}) is unhealthy in (target-group {{target-group-name}}) due to (reason {{failure-reason}})
<a name="service-unhealthy-ec2-taskset"></a>

This message indicates that a task in a task set running on an EC2 instance is failing health checks. For more information, see the following:
+ [How do I get my Amazon ECS tasks that use the EC2 to pass the Application Load Balancer health check?](https://repost.aws/knowledge-center/troubleshoot-unhealthy-checks-ecs)

## Fargate: (service {{service-name}}) (task {{task-id}}) (port {{port-number}}) is unhealthy in (target-group {{target-group-name}}) due to (reason {{failure-reason}})
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This message indicates that a Fargate task is failing health checks. 

For more information about troubleshooting health check failures in Fargate tasks, see [How do I troubleshoot health check failures for Amazon ECS tasks on Fargate?](https://repost.aws/knowledge-center/ecs-fargate-health-check-failures).

## Fargate with taskSet: (service {{service-name}}, taskSet {{taskSet-id}}) (task {{task-id}}) (port {{port-number}}) is unhealthy in (target-group {{target-group-name}}) due to (reason {{failure-reason}})
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This message indicates that a task in a task set running on Fargate is failing health checks. 

For more information about troubleshooting health check failures in Fargate tasks, see [How do I troubleshoot health check failures for Amazon ECS tasks on Fargate?](https://repost.aws/knowledge-center/ecs-fargate-health-check-failures).