Hi,
Just another thought (tho I have so few each day I have to ration them), but can you, or rather should you set up a public server using port 80 ?
Your image shows private port 443 with the HTTPS item unchecked.... Maybe try some other random port to forward/redirect thru like 48990....
You image also shows only TCP is allowed....can you be sure that outside users wont hit you up using a UDP port as well ?