IIS web server c- IIS: “time-taken” in log formatĪpache Tomcat web server d- Apache Tomcat Access logs: %D in log format Make sure that your load balancer allows traffic with registered targets Nginx web server b- Nginx: $request_time and $upstream_response_timein log format (Optional) Add the following custom filters on the backend web servers application logs to help determine the cause of the slow response times:Īpache web server a- Apache : %D in log format Make sure that the application doesn't take longer to respond than the configured idle timeout. Modify your application to respond to the HTTP request faster. Modify the idle timeout for your load balancer so that the HTTP request completes within the idle timeout period. The timeout value may indicate the time elapsed after the load balancer request was received from the target. ![]() If there aren't any HTTPCode_ELB_504_Count metric datapoints, the 504 errors are being returned by your application servers, not the load balancer.Ĭheck the maximum and average values for the CloudWatch metric TargetResponseTime. The HTTPCode_ELB_5XX metric indicates the 504 error originated from the load balancer. If CloudWatch metrics are enabled, check CloudWatch metrics for your Application Load Balancer. By default, the idle timeout for Application Load Balancer is 60 seconds. Load balancer HTTP 504 errors can occur if the backend instance didn't respond to the request within the configured idle timeout period. Resolution Check your load balancers idle timeout and modify if necessary The target is an AWS Lambda function and the service didn't respond before the connection timeout expired.The load balancer timed out waiting for the missing bytes. The target returns a Content-Length header value that is larger than the entity body. ![]() The network ACL for the subnet didn't allow traffic from the targets to the load balancer nodes on the ephemeral ports (1024-65535).The load balancer established a connection to the target but the target didn't respond before the idle timeout period elapsed.The load balancer failed to establish a connection to the target before the connection timeout expired (10 seconds).A HTTP 504 error is a HTTP status code that indicates a gateway or proxy has timed out.Īpplication Load Balancer HTTP 504 errors can occur if:
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