Why Am I Seeing the Message "No backend available"?

  • Check whether the backend service is accessible, and modify the backend service if it is inaccessible.

  • Check the ECS security group configurations of the backend service and verify that the required port has been enabled.

  • Check whether the backend service address is a public IP address. If yes, enable outbound access on the Gateways > Access Console > Gateway Information page.

  • Check whether ACL configurations of the VPC restrict the communication between the API gateway and the subnet where the backend service is located.

  • If you use a VPC channel, check whether the service port, health check port, and backend servers of the VPC channel have been correctly configured.

    .