How can I determine which CAS server is causing the 503 error in a load-balanced Exchange 2013 environment?

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How can I determine which CAS server is causing the 503 error in a load-balanced Exchange 2013 environment?
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Check the load balancer logs to identify which CAS server is being reported as unavailable or failing the health checks. If the load balancer is configured to send a specific server in the HTTP header, you may check the header response. Also, try accessing OWA directly via the server's FQDN to isolate the problem.