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#HTTP ERROR 504 VMWARE HORIZON CLIENT CODE#

This can result in a subsequent SYN retry timeout. The backend instance then responds with a SYN-ACK, and the load balancer sends an empty ACK to the backend instance.īecause the last ACK is empty, the backend doesn't accept the ACK, and instead resends a SYN-ACK to the load balancer. When TCP_DEFER_ACCEPT is activated for Apache backend instances, the load balancer initiates a connection by sending a SYN to the backend instance. To resolve this, activate keep-alive settings on your backend instances, and then set the keep-alive timeout to a value greater than the load balancer’s idle timeout.

When the backend instance closes a TCP connection to the load balancer before it reaches its idle timeout value, an HTTP 504 error might display. Make sure that your backend instances keep connections open

Tune your application to respond more quickly.

Modify the idle timeout for your load balancer so that the HTTP request is completed within the idle timeout period.

To resolve this, you can do one of two things: When latency data points are equal to your configured load balancer timeout value, and HTTPCode_ELB_5XX has data points, at least one request has timed out. If CloudWatch metrics are turned on, check CloudWatch metrics for your load balancer. By default, the idle timeout for Classic Load Balancer is 60 seconds. The most common reason for an HTTP 504 error is that a corresponding instance didn't respond to the request within the configured idle timeout. When troubleshooting, investigate the following: Check your load balancer’s idle timeout, and then modify if necessary

#HTTP ERROR 504 VMWARE HORIZON CLIENT CODE#

An HTTP 504 error is an HTTP status code that indicates a gateway or proxy has timed out.