My apologies,
MobiLinc Connect is by far the easiest way to get remote access working with MobiLinc instead of having u=to configure your router correctly.
Based on your info it looks like the Private IP address is wrong in the port mapping field of the Airport. When port forwarding you need to enter the IP address of the ISY here (config tab of Admin Console) so that the router understands what internal IP (your ISY) it should route traffic coming in from port 443 to.
In MobiLinc you would enter your router's EXTERNAL IP address for the HTTPS field and port 443 for the External Port. You can easily find your external IP address by going to
http://whatismyip.com.
Hopefully some of this info helps. Please ask if you have more specific questions. The screenshots are excellent by the way.
Wes