Troubleshoot your Application Load Balancers – Elastic …

You configured an AWS WAF web access control list (web ACL) to monitor requests to your Application Load Balancer and it blocked a request. HTTP 405: Method not allowed . The client used the TRACE method, which is not supported by Application Load Balancers. … The load balancer received an X-Forwarded-For request header with too many IP …

https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-troubleshooting.html