Load Balance in Fortigate 100E not keep the outside IP Address

Dear All,

I have a problem with load balace feature in Fortigate 100E.

I have configured the load balance with outside IP address is 192.168.252.233, and there are 2 real servers 192.168.120.5 and 192.168.120.6.

The load balance works fine, but there is a problem that when client try to access http://192.168.252.233 from out side, it will redirect to http://192.168.120.5 and .6. That means client can see the internal IP address and it not makes sense.

The firewall is running on version v7.2.3.

Anyone have the idea about that?

Thanks all.