| copyright | lastupdated | keywords | subcollection | ||
|---|---|---|---|---|---|
|
2018-11-12 |
troubleshooting, problem, server, application |
loadbalancer-service |
{{site.data.keyword.attribute-definition-list}}
{: #the-back-end-server-is-unhealthy} {: troubleshoot} {: support}
Your back-end server's health is failing. {: tsSymptoms}
To rectify this problem, check the following possible issues: {: tsResolve}
- Does the port of the configured back-end protocol match the port that your application is listening on?
- Does the configured health-check have the correct protocol (TCP or HTTP), port, and URL (for HTTP) information? For HTTP, ensure that your application responds with
200 OKfor the configured health check URL. - Is the back-end server on a different subnet than the load balancer? If not, ensure that VLAN spanning is enabled.
- Is the back-end server a virtual server with an enabled security group? If so, ensure that the security group rules allow traffic between the load balancer and the virtual server.