Why Azure LB with http(s) probe treats DSM nodes down when it is up and running
Azure LB treats the node health only when it receives the status code 200 however Foranix appliances send status code 204 when the node is healthy hence Azure LB treats the node as unhealthy.
Unfortunately, the http(s) status code can not be customized in Azure LB and customers can configure TCP health probe.
More information from Microsoft : https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview
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