Before you begin

Before you start any load balancer troubleshooting procedure, ensure the following:

• Verify that the load balancer's VPC has security groups that allow the health check and the data path ports.
• Verify that the health field in each member is ok. If the health field is shown as faulted or unknown, ensure that the load balancer member's virtual server instance is responding to the load balancer health check requests by taking the following actions:
  • Verify in the load balancer member virtual server that a process (for example, an Nginx server) is running and listening on the back-end pool health monitor port.
  • If the back-end pool health monitor port is not specified during the back-end pool creation, health check requests are sent to the member port. In this case, verify in the load balancer member virtual server that a process is running and listening on the load balancer member port.