So, I got frustrated trying to figure this out today. I figured I would try something different than my dyndns.org access and created an ISY login on the ISY Portal and did the trial sign up. I uninstalled Mobilinc pro, rebooted my phone, reinstalled the app. I changed my port back to 443, removed the port forwarding on the router, and entered everything into the Mobilinc Pro as the site directed, (Host = ISY, user name and PW, no local http:, local port 80, my.isy.io for the secure https, secure port 443 and auto detect). Even after I did all of this I still get the same error message.