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We have a WCF service on a NLB cluster. The service is reachable via the NLB address but also via the specific node address.

The problem is that the service also has some maintenance interfaces that must not be reachable on the NLB IP.

I tried to configure this with

<endpoint address="http://NODENAME:8440/Maint" ...

but the endpoint is always available on both the NLB and node address. Apparently NODENAME is ignored even with hostNameComparisonMode="Exact". There is a related question that also has no solution.

Is there another way to prevent a client to connect to the service on the NLB interface?