WLLB and Port Forwarding

Good day everyone,

cheers!

 i have some issue, about port forwarding.

i already setup WLLB connection and its working fine. then when i trying to setup port forward to my ipcam.

I created VIP>>interface "Any">>external ip add "one of my public ip in WLLB">>mapped IP "ip of my ipcam">> protocol "UDP">>external service port "8888" map to port "8888"..

then i created a policy>>>Incming Intf "Wan-load-Balance>>Outgoing " Port Of my ipcam">>>Source "ALL" Destination add "VIP">>>schedule  "ALways">> services "All">>>nat "Enable"..

then nothing happened. when i tried to access my ipcam using my pub. isp.

*FGT 100d 5.4

any suggestion, tutorial.

thanks in advance.