I haven't tried this setup yet, but I would use the same port for all servers, that is, virtual server (443), realserver1 (now: 1662) and realserver2 (443).
Assuming you have 3 policies in place which allow the traffic from WAN to realserver(s).
Can you sniff the traffic, like in
diagnose sniffer packet wan1 'port 443' 4 # for virtual server
diagnose sniffer packet any 'host 220.127.116.11 and port 443' 4
and post the results here?
"Kernel panic: Aiee, killing interrupt handler!"