Resolving Load Balancer Target Group Health Check Failures

If your load balancer target groups are showing as unhealthy or failing health checks, this is typically caused by the health check being configured to hit an endpoint that returns an error status code. Common Cause The most common reason for target group health check failures is when the health check path is configured to hit an endpoint that returns a 404 (Not Found) or other error status code instead of a successful 200 response. Resolution To resolve this issue: Check your load balancer's health check configuration Verify that the health check path points to a valid endpoint Ensure the endpoint returns a 200 (OK) status code Update the health check path to the correct endpoint if needed Once the health check path is updated to a valid endpoint that returns a 200 status code, the target groups should become healthy and traffic will route normally again.