Health Monitor marking the Pool members down

This can be a number of things - what type of health monitor have you used? ie tcp/http A tcp monitor will fail if it receives a rst from the endpoint ( or no route to host ) An http monitor will send the request and expect a response ( any response by default )

A good way to troubleshoot this is to do a tcpdump to see what is actually happening. Feel free to post the relevant config so I can understand the issue better.