VIP IP Public to ip private remote server cant contacted JUNIPER SSG5

Hi guys,

i have ip public 103.244.205.25

and then i have ip local : 10.173.1.0/24

and this ip remote : 192.168.2.30

between local and remote ip each can ping via ipsec connection. but when i configuring VIP with IP Public 103.244.205.25 and then mapping to IP 192.168.2.30 there is an error " VIP server 192.168.2.30 cannot be contacted "  

is there my configuration wrong?

Please your advice

Thanks