I've had this issue too and disabling/re-enabling a node tends to fix this. Why does Passive Monitoring only recover nodes when it sees successful idempotent requests? Surely a successful POST request with a 200 response in a timely manner should recover the node from a Passive Monitoring failure?? This article https://community.pulsesecure.net/t5/Pulse-Secure-vADC/Feature-Brief-Health-Monitoring-in-Stingray-Traffic-Manager/ta-p/28516, nor the Help guide withins the VTM mention this.
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