pool member not responding to https port (443) but responding on tcp.

for our pool member we have configured health monitor https (443) but some time the member is responding to the monitor and after some time it will not respond and our pool members get down so application is also not working.

have you tried tcpdump?

do you have server's private key to decrypt packet. also, since it is https, you may have to remove the monitor from pool first, start tcpdump and assign it back to the pool. so, you will be able to decrypt it.