This topic provides answers to some frequently asked questions about Classic Load Balancer (CLB).
Health checks
What do I do if health checks generate a large number of web logs?
How do I troubleshoot health check exceptions of a Layer 4 (TCP/UDP) listener?
How do I troubleshoot health check exceptions of a Layer 7 listener (HTTP/HTTPS)?
Why do health checks fail even if my website can be accessed?
Access to Server Load Balancer (SLB) instances
Why does a timeout error occur when I access the service address of an SLB instance?
Why does a request timeout error occur during stress testing?
Listener configurations
Why does an HTTP request to a Layer 7 SLB instance contain the "Transfer-Encoding: chunked" header?
Why are response headers removed after I use a Layer 7 SLB instance to forward requests?
Backend servers
Why are requests unevenly distributed among backend servers?
Why do backend ECS instances frequently receive requests whose User-Agent value is KeepAliveClient?
What do I do if a large number of connections to backend servers are in the TIME_WAIT state?
How do request packets interact with Layer 4 and Layer 7 listeners of SLB?