How to Troubleshoot Load Balancer Health Check Issues
Health checks often fail due to firewalls or misconfigured backend server software.
Why are there multiple 408 errors in App Platform's runtime logs?
Validated on 24 Jun 2024 • Last edited on 18 Mar 2026
Multiple 408 errors are often caused by your app sending health checks with very short timeouts to App Platform. They typically don’t affect the functionality of the app.
Some apps, especially PHP apps, send health checks that time out before App Platform responds, and this causes the 408 error. You can’t prevent the 408 errors from appearing in the runtime logs because you can’t filter or suppress the health checks.
Related Topics
Why does my load balancer respond with an HTTP 503 error?
Load balancers return 503 errors when there are either no Droplets assigned to them or all of the assigned Droplets are unhealthy.
Why do my load balancer's Kubernetes node(s) have the No Traffic status?
Kubernetes service ’externaltrafficpolicy’ field controls how nodes respond to health checks.