Fortigate VIP

Hi To all,

Need some help, i am using Fortigate 900d and i will have to setup a VIP for 2 application and port forward their ports.

For the first application, its default port was 9300 and i port forward it using 8050, the port forward works properly when logged in in the web application.

My main concern is the second application, its default port is 9443 and I use 8021 for port forward, the application webpage works properly using the port but when I logged in, it redirects me to its default port which should not be happening since I port forward its default port to 8021. 

Thanks in advance for any queries or inputs..