Port forwarding on Fortigate

Create the NAT Rule

1. Login to the firewall and Navigate to Policy & Objects > Virtual IPs
2. Select Create New > Virtual IP
3. Fill out all the fields for your required NAT Rule and ensure you enable port forwarding

Create the Access Policy

1. Login to the firewall and navigate to Policy & Objects > IPv4 Policy
2. Select Create New

3. Set the following fields as described bellow

    Incoming Interface: WAN
   
    Outgoing Interface: your LAN/VLAN interface
   
    Source: ALL
   
    Destination: The Virtual IP we created earlier
   
    Service: ALL
   
    Action: ACCEPT