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Might this work, assume the pool members are listening on port 2389 add 1 default tcp half open monitor to the pool. Then create two custom tcp half open monitors and change the Alias Port to tbe 7676 for one and 4848 for the other. Assign all 3 monitors to the pool and change "Availability Requirement" to be All. That way if 1 pool member fails any of the monitors e.g. port 7676 then the pool member status changes to Down. Only pool members that successfully pass all 3 monitors are available.

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