For anyone still not able to get that light from YELLOW to GREEN. It was rather annoying having people mislead me on setting up my port forwarding / triggering. I know there are a lot of differant routers out there but hey, here goes for "easy mode".
Step1. Pick a port for your listening port.
Step2. Copy / Write it down ... whatever works
Step3. Open your router config
Step4. Setup PORT FORWARDING and put in that listening port.
Step5. Forward that port to a specific computer (by name or WAN IP)
Step6. <if needed> Setup computer2 in saem way, differant port tho.
Easy mode complete and green light activated. TY for your time and effert in this matter