Enable Port Forwarding in Fortinet Firewall.

Port Forwarding in fortinet is very simple. Follow the below steps and you are good to go.

Step-1

Open your fortinet and go to Policies and objects -> Virtual IPs

Step-2

Configure as shown below, Keep external ip empty if you are using any DynDNS service.
If you have static ip then you can enter the ip in there.

Step-3

Create one Virtual IP group and add the newly created ports in that as shown below.

Step-4

Now go to Policies and create one policy for port forwarding as shown below. In the destination address add the "port forward"  group.

Port forwarding is configured now in the Fortinet. You can now connect from outside on the ports forwarded.