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SOA-C02 · Question #252

A company runs an application on an Amazon EC2 instance. A SysOps administrator creates an Auto Scaling group and an Application Load Balancer (ALB) to handle an increase in demand. However, the EC2…

The correct answer is B. Verify that the application is running on the protocol and the port that the listener is expecting. Target.FailedHealthChecks Verify that the target is listening for traffic on the health check port. You can use the ss command on Linux targets to verify which ports your server is listening on. For Windows targets, you can use the netstat command…

Submitted by klara.se· Mar 30, 2026Networking and Content Delivery

Question

A company runs an application on an Amazon EC2 instance. A SysOps administrator creates an Auto Scaling group and an Application Load Balancer (ALB) to handle an increase in demand. However, the EC2 instances are failing the health check. What should the SysOps administrator do to troubleshoot this issue?

Options

  • AVerify that the Auto Scaling group is configured to use all AWS Regions.
  • BVerify that the application is running on the protocol and the port that the listener is expecting.
  • CVerify the listener priority in the ALB.
  • DVerify the maximum number of instances in the Auto Scaling group.

How the community answered

(70 responses)
  • A
    4% (3)
  • B
    76% (53)
  • C
    7% (5)
  • D
    13% (9)

Explanation

Target.FailedHealthChecks Verify that the target is listening for traffic on the health check port. You can use the ss command on Linux targets to verify which ports your server is listening on. For Windows targets, you can use the netstat command. https://aws.amazon.com/premiumsupport/knowledge-center/elb-fix-failing-health-checks-alb/

Topics

#ALB health check#listener configuration#Auto Scaling#EC2

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