actually there is a mistake.
Here is what it should look like
real XX1
address x.x.x.x
inservice
real XX2
address x.x.x.x
inservice
serverfarm YYY
nat server
no nat client
real name XX1
inservice
real name XX2
inservice
probe tcp
sticky 1 ssl timeout 60
vserver YYY
virtual xx.xx.xx.03 tcp http
serverfarm YYY
inservice
vserver YYY1
virtual xx.xx.xx.03 tcp https
serverfarm YYY
sticky 60 group 1
inservice
Gilles.