Help Center/ API Gateway/ FAQs/ Calling APIs/ Why Am I Seeing the Error Message "No backend available" When I Call an API?
Updated on 2024-12-04 GMT+08:00
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Why Am I Seeing the Error Message "No backend available" When I Call an API?

  • 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.
    If the VPC channel type is microservice, check whether a route has been added to the gateway. For details, see Load Balance Channel.

    Backends of the shared gateway do not support private network load balancers.

Parent topic: Calling APIs