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Tag: Load Balancer

Microsoft AD FS behind a Load Balancer

A friend called me today with a urgent question: Why did our Load Balancer shows all Nodes in our AD FS Farm as down?

The answer is a bit complicated: AD FS (Active Directory Federation Services) doesn’t answer correct to the bind/probe and therefore, the Load Balancer marks the Server(s) as down. The Problem is Layer 6/7 and based on how Microsft handles SSL for SNI (Server Name Indication) within AD FS. WAP (Web Application Proxy) handles that, but most load balancers have an issue with that.

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