Need help with Remote Desktop

#1
Have no problem using fantastic Remote Desktop on network computers here, but am having problems connecting to a family computer cross country via internet. They configured it just as we did here (enabled, designated Users, passworded Users, turned off Power Options, no router to forward port). Then I tried to sign on with their Internet IP address (from www.whatismyipaddress.com) and User name and get repeated generic fail message. What am I missing?
 


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