1. Go to Firewall > Aliases
2. Click on + Add
3. Enter the name VirtualDesktopPorts
4. Change the type to Port(s)
5. Enter the following ports: 38810 38820 38830 38840
6. Hit Save and then Apply Changes
7. Go to Firewall > NAT
8. Click on Outbound
9. Change the mode to Hybrid Outbound NAT rule generation
10. Click Save and then Apply Changes
11. Click ^ Add
NAT Outbound rule details
Interface: WAN
Protocol: Any
Source address: Choose the correct Virtual Desktop net
Source port: choose the alias VirtualDesktopPorts
Destination: Any
Static port: checked
13. Click Save and then Apply Changes
14. Create a Port forward rule to the Virtual Desktop PC address using the VirtualDesktopPorts alias